# Khan/khan-exercises

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 ec93fc3 Split percentage word problems spicyj authored Jun 22, 2011 1 2 3 4e4cb9b lint: tabs->spaces and jQuery->$for exercises beneater authored Apr 10, 2012 4 5 Percentage word problems 2 6 ec93fc3 Split percentage word problems spicyj authored Jun 22, 2011 7 8 4e4cb9b lint: tabs->spaces and jQuery->$ for exercises beneater authored Apr 10, 2012 9
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13 randRange( 10, 150 ) 14 randRange( 50, 999 ) 15 round(YEAR_THIS * 10000 / (100 + YEAR_PERCENT_MORE)) / 100 16
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18 person(1) has YEAR_PERCENT_MORE% more money today than he(1) did this time last year. If person(1) has $YEAR_THIS today, how much money did he(1) make over this past year? (Round to the nearest cent, or hundredth of a dollar.) 19 round((YEAR_THIS - YEAR_LAST) * 100) / 100 20 21 Let x be the amount of money that he(1) had last year. 22 x + YEAR_PERCENT_MORE / 100x =$YEAR_THIS

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(100 + YEAR_PERCENT_MORE) / 100x = $YEAR_THIS 24 x = \dfrac{$YEAR_THIS}{(100 + YEAR_PERCENT_MORE) / 100}

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x = $YEAR_LAST (rounding to the nearest penny in this step) 26 So, he(1) had$YEAR_LAST last year, but we want to know how much he(1) has made over the past year!

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\text{money made over the past year} = \text{amount of money today} - \text{amount of money last year}

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\qquad =$YEAR_THIS-$YEAR_LAST

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\qquad \approx $round((YEAR_THIS - YEAR_LAST) * 100) / 100 30 So, the answer is$round((YEAR_THIS - YEAR_LAST) * 100) / 100.

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35 randRange( 10, 25 ) 36 randRange( 5, 100 ) 37 round(DOLLARS * 100 * 100 / (100 - PERCENT_OFF)) / 100 38
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person(1) has $DOLLARS to spend at a store. The store currently has a sale where the sale price is PERCENT_OFF% off the marked price. What is the highest marked price that person(1) can afford? (Round to the nearest cent, or hundredth of a dollar.) 41 HIGHEST_PRICE 42 43 44 Let x be the highest marked price that person(1) can afford. 45 x-(PERCENT_OFF/100)x = \text{sale price} = \text{amount person( 1 ) has to spend} 46 ((100-PERCENT_OFF)/100)x =$DOLLARS

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x = \$HIGHEST_PRICE

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ec93fc3 Split percentage word problems spicyj authored Jun 22, 2011 52 53
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