Answer the following question.
While passing by a store, Miley noticed that a bag that cost $150 last week is now on sale for $135. What percent is the discount?
Step-by-step reasoning process: The bag is now sold for $150 - $135 = $15 less. The discount is 15 / 150 = 1 / 10. Thus, the percent discount is 1 / 10 x 100% = 10%.
The answer is 10.

Answer the following question.
Last month, you borrowed $100 from your friend. If you promise to pay her today, how much will you give to your friend if both of you agreed to return the money with a 10% increase?
Step-by-step reasoning process: The increase is $100 x 10 / 100 = $10. So you have to give $100 + $10 = $110 to your friend today.
The answer is 110.

Answer the following question.
John buys 30 ducks for $10 each. They weigh 4 pounds and he sells them for $5 per pound. How much profit did he make?
Step-by-step reasoning process: He bought the ducks for 30 * 10 = $300. He sold each duck for 4 * 5 = $20. So he sold all the ducks for 30 * 20 = $600. So he made a profit of 600 - 300 = $300.
The answer is 300.

Answer the following question.
Alyana has a pizza that is cut into 16 slices. After she and her friends finish eating, there are 4 slices left. If each of them ate 2 slices of pizza, how many people ate the pizza?
Step-by-step reasoning process: 16 - 4 = 12 slices of pizza were eaten. So there were 12 / 2 = 6 people eating the pizza.
The answer is 6.