[Question]: Randy just turned 12 and started playing the piano. His friend Sheila told him about the 10,000-hour rule which says, after 10,000 hours of practice, you become an expert or master in your field. If Randy wants to become a piano expert before he is 20, how many hours a day will he need to practice if he practices every day, Monday Friday, and takes two weeks off for vacation each year?
[Answer]: Randy has 20 12 = 8 years until he is 20. He must practice 10,000 hours / 8 years = 1,250 hours a year to become an expert. There are 52 weeks in a year 2 weeks of vacation Randy plans to take = 50 weeks of practice for Randy. Randy will practice Monday Friday, which is 5 days a week, so 50 weeks x 5 days = 250 days of practice each year. Randy will need to practice 1250 hours / 250 days = 5 hours each day.
So the answer is 5.

[Question]: James creates a media empire. He creates a movie for $2000. Each DVD cost $6 to make. He sells it for 2.5 times that much. He sells 500 movies a day for 5 days a week. How much profit does he make in 20 weeks?
[Answer]: He sold each DVD for 6 * 2.5 = $15. So he makes a profit of 15 - 6 = $9. So each day he makes a profit of 9 * 500 = $4500. So he makes 4500 * 5 = $22,500. He makes 22,500 * 20 = $450,000. Then after the cost of creating the movie he has a profit of 450,000 - 2000 = $448,000.
So the answer is 448000.

[Question]: Laura is planning her wedding. She expects 220 people to attend the wedding, but she has been told that approximately 5% typically don't show. How many people will go to her wedding?
[Answer]:
Laura expects 100 - 5 = 95% to show up. Laura expects 220 * 0.95 = 209 guests.
So the answer is 209.