# Khan/khan-exercises

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 4fce3f6 multiplication_1 finished, percentage_word_problems_1 frameworked, st… swestwood authored May 20, 2011 1 e9807ff Clean up the exercise files using the new cleaning utility. jeresig authored Apr 16, 2013 2 0f0c630 Clean up the exercise files using the new cleaning utility. (II) cbhl authored Apr 16, 2013 3 4e4cb9b lint: tabs->spaces and jQuery->$for exercises beneater authored Apr 10, 2012 4 Percentage word problems 1 5 4fce3f6 multiplication_1 finished, percentage_word_problems_1 frameworked, st… swestwood authored May 20, 2011 6 7 4e4cb9b lint: tabs->spaces and jQuery->$ for exercises beneater authored Apr 10, 2012 8
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12 randRange( 1, 150 ) 13 randRange( 2, 100 ) 14
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16 What is A_SIMPLE% of B_SIMPLE? (Round to nearest whole number.) 17

0f0c630 Clean up the exercise files using the new cleaning utility. (II) cbhl authored Apr 16, 2013 18

round((A_SIMPLE * B_SIMPLE) / 100)

4e4cb9b lint: tabs->spaces and jQuery->$for exercises beneater authored Apr 10, 2012 19 20 21 A_SIMPLE / 100 \times B_SIMPLE \approx round((A_SIMPLE * B_SIMPLE) / 100) 22 23 24 0f0c630 Clean up the exercise files using the new cleaning utility. (II) cbhl authored Apr 16, 2013 25 4e4cb9b lint: tabs->spaces and jQuery->$ for exercises beneater authored Apr 10, 2012 26

27 B_SIMPLE is A_SIMPLE% of what number? (Round to the hundredths place.) 28

0f0c630 Clean up the exercise files using the new cleaning utility. (II) cbhl authored Apr 16, 2013 29

round(((B_SIMPLE * 100) / A_SIMPLE) * 100) / 100

4e4cb9b lint: tabs->spaces and jQuery->$for exercises beneater authored Apr 10, 2012 30 31 Let x be the number that B_SIMPLE is A_SIMPLE% of. 32 A_SIMPLE / 100 \times x = B_SIMPLE 33 x=B_SIMPLE/A_SIMPLE / 100 34 x \approxround((B_SIMPLE * 100/A_SIMPLE * 100))/100 35 36 37 38 39 randRange( 2, 100 ) 40 BANK_FEWER + randRange(5, 2 * BANK_FEWER + 10 ) 41 42 43 person(1) has BANK_MORE dollars in the bank today. Yesterday, he(1) had BANK_FEWER dollars in the bank. By what percentage did person(1)'s bank account increase over the past day? (Round your answer to the nearest hundredth of a percent.) 0f0c630 Clean up the exercise files using the new cleaning utility. (II) cbhl authored Apr 16, 2013 44 roundTo(4, (BANK_MORE - BANK_FEWER) / BANK_FEWER) 4e4cb9b lint: tabs->spaces and jQuery->$ for exercises beneater authored Apr 10, 2012 45
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The bank account grew by BANK_MORE - BANK_FEWER = BANK_MORE - BANK_FEWER dollars

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\frac{BANK_MORE - BANK_FEWER}{BANK_FEWER} \approx round(((BANK_MORE - BANK_FEWER) * 10000) / BANK_FEWER) / 100\%

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0f0c630 Clean up the exercise files using the new cleaning utility. (II) cbhl authored Apr 16, 2013 50
4e4cb9b lint: tabs->spaces and jQuery->$for exercises beneater authored Apr 10, 2012 51 52 person(1) has BANK_FEWER dollars in the bank today. Yesterday, he(1) had BANK_MORE dollars in the bank. By what percentage did person(1)'s bank account decrease over the past day? (Round your answer to the nearest hundredth of a percent.) 0f0c630 Clean up the exercise files using the new cleaning utility. (II) cbhl authored Apr 16, 2013 53 roundTo(4, (BANK_MORE - BANK_FEWER) / BANK_MORE) 4e4cb9b lint: tabs->spaces and jQuery->$ for exercises beneater authored Apr 10, 2012 54
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The bank account decreased by BANK_MORE - BANK_FEWER = BANK_MORE - BANK_FEWER dollars

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\frac{BANK_MORE - BANK_FEWER}{BANK_MORE} \approx round(((BANK_MORE - BANK_FEWER) * 10000) / BANK_MORE) / 100\%

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61 randRange( 10, 150 ) 62 randRange( 50, 999 ) 63 round(YEAR_THIS * 10000 / (100 + YEAR_PERCENT_MORE)) / 100 64
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66 person(1) has YEAR_PERCENT_MORE% more money today than he(1) did this time last year. If person(1) has YEAR_THIS dollars today, how many dollars did he(1) have this time last year? (Round to the nearest penny, which is 1/100 of a dollar.)

0f0c630 Clean up the exercise files using the new cleaning utility. (II) cbhl authored Apr 16, 2013 67

YEAR_LAST

4e4cb9b lint: tabs->spaces and jQuery->\$ for exercises beneater authored Apr 10, 2012 68
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Let x be the amount of money that he(1) had last year.

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x + YEAR_PERCENT_MORE / 100x = YEAR_THIS

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(100 + YEAR_PERCENT_MORE) / 100x = YEAR_THIS

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x = \frac{YEAR_THIS}{(100 + YEAR_PERCENT_MORE) / 100}

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x \approx YEAR_LAST

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e9807ff Clean up the exercise files using the new cleaning utility. jeresig authored Apr 16, 2013 78 79 80 81
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