Answer the following question.
James pays $1000 for advertising. It brought 100 customers to his site and 80% of those bought something at the store that cost $25. How much profit does he gain from the ad?
Step-by-step reasoning process: 100 * .8 = 80 customers bought something. That means they were worth 80 * 25 = $2000. So he gained 2000 - 1000 = $1000 from the ad.
The answer is 1000.

Answer the following question.
It costs Molly $5 per package to send Christmas gifts to her relatives by mail. She has two parents and three brothers, and each of her brothers is married with 2 children each. If she sends one package to each relative by mail, how much does it cost her to send all of the gifts by mail to her relatives, in dollars?
Step-by-step reasoning process: Molly has two parents and three brothers, which totals 2 + 3 = 5 parents and siblings. Since each brother is married with 2 children, then each brother has a family containing 1 + 2 = 3 people. Thus, the families of the three brothers contain an additional 3 * 3 = 9 relatives. In total, Molly has 5 + 9 = 14 relatives. At $5 per package, Molly will spend 14 * $5 = $70 to mail the packages.
The answer is 70.

Answer the following question.
The balance of Pam's bank account tripled during the year. At the end of the year, Pam withdrew $250. If her current balance is $950, how much did she have in the bank account at the beginning of the year?
Step-by-step reasoning process: First, we have to come up with the balance before her withdrawal. $950 (current) + $250 (withdraw) = $1200. Now since we know that is triple, we divide by 3. $1200 / 3 = $400.
The answer is 400.

Answer the following question.
Janeth bought 5 bags of round balloons with 20 balloons in each bag. She also bought 4 bags of long balloons with 30 balloons in each bag. While blowing up the balloons, 5 round balloons burst. How many balloons are left?
Step-by-step reasoning process: Janeth bought 5 x 20 = 100 round balloons. She bought 4 x 30 = 120 long balloons. So, she has a total of 100 + 120 = 220 balloons. Since 5 round balloons burst, then there are only 220 - 5 = 215 balloons left.
The answer is 215.