I want to check my answers

Question

1. The town population increased from 80,000 to 90,000 in ten years. What was The percent of increase?
2. A $15 item on sale for $12 is marked down what percent
3. If Jenna buys an item for 40% off the regular price will he pay more or less than half price
4. If Jenna saves $20 buying an item for 40% off the regular price then what were the regular price and sales price ?

Answer 1

I'll be glad to check your answers. Please post them.

Answer 2

20%