PLEASE HELP
1.A store increases the price of a sweater from $20 to $22.

What is the percent of increase?

2.Kevin buys 4 folding chairs. Each chair costs $13.50. The sales tax is 6.5%.

What is the amount of sales tax for Kevin's purchases?

3.Harriet's haircut costs $36.

As a tip, she gives the hairdresser 15% of this amount.

What is the total amount Harriet pays for her haircut, including tip?

4.At an appliance store, the price of a refrigerator is marked up 25% to $406.25.

What was the price of the refrigerator before the markup?

5.Clea estimates that a glass contains 250 mL of water. The actual amount of water in the glass is 279 mL.

To the nearest tenth of a percent, what is the percent error in Clea's estimate?

6.The price of a wallet is $32.95 and the sales tax is 7.5%.

What is the total cost of the wallet?

7.A car salesman had $65,100 in total monthly sales last month. He made $1,953 in commission from those sales.

What is the salesman's commission as a percent of his total monthly sales?