Caprice is taking piano lessons. Her mother pays the teacher $10 for every half-hour of teaching her daughter. If Caprice is taking one lesson per week, and the lesson lasts 1 hour, how much money would the teacher earn in 5 weeks?
Let's think: If half - hour lesson is worth $10, then a one - hour lesson costs 2 * 10 = $20. One lesson per week would mean that in 5 weeks the teacher would earn 20 * 5 = $100.. The answer is: 100.

The selling price of a bicycle that had sold for $220 last year was increased by 15%. What is the new price?
Let's think: The price of the bicycle increased by $220 * 15 / 100 = $33. Adding the increment price, the new price is $220 + $33 = $253.. The answer is: 253.

Whitney bought 9 books about whales and 7 books about fish. She also bought 3 magazines. Each book cost $11 and each magazine cost $1. How much did Whitney spend in all?
Let's think: The total number of books is 9 books + 7 books = 16 books. The cost of the books is $11 / book × 16 books = $176. The cost of the magazines is $1 / magazine × 3 magazines = $3. Whitney spent $3 + $176 = $179 in all.. The answer is: 179.

It takes Polly 20 minutes to cook breakfast every day. She spends 5 minutes cooking lunch. She spends 10 minutes cooking dinner 4 days this week. The rest of the days she spends 30 minutes cooking dinner. How many minutes does Polly spend cooking this week?
Let's think:
Polly spends 20 * 7 = 140 minutes cooking breakfast. She spends 5 * 7 = 35 minutes cooking lunch. She spends (10 * 4) + (30 * 3) = 130 minutes cooking dinner. Therefore, she spends 140 + 35 + 130 = 305 minutes cooking this week.. The answer is: 305.