Question: In a stationery store, there are three kinds of pencils. A pencil with an eraser, which costs $0.8 each, a regular pencil for $0.5 each, and a short pencil for $0.4 each. This store was able to sell 200 pencils with an eraser, 40 regular pencils, and 35 short pencils. How much money did the store make from these sales?
Answer with step-by-step thinking: For pencils with erasers, the store received a total of 200 * 0.8 = $160. For regular pencils, the store received 40 * 0.5 = $20. And for short pencils only 35 * 0.4 = $14. In total, the store made 160 + 20 + 14 = $194 from selling these pencils.
So the answer is 194.

Question: Vivian is responsible for making sure her students get 2 15-minute recess breaks a day, a 30-minute lunch and another 20-minute recess break. How much time do her students spend outside of class?
Answer with step-by-step thinking: They get 2 15 minute breaks a day so that's 2 * 15 = 30 minutes. They get 30 minutes for lunch and 20 minutes for recess plus an additional 30 minutes of recess for a total of 30 + 20 + 30 = 80 minutes spent outside of class.
So the answer is 80.

Question: John buys a pair of earbuds that cost $200. If tax was 15%, how much did he pay after tax?
Answer with step-by-step thinking:
The tax was 200 * .15 = $30. So he paid 200 + 30 = $230.
So the answer is 230.