Olga bought a new skirt that cost $20. Sales tax is 5%. How much did Olga pay, including sales tax? 7.

21

Step-by-step explanation:

Sales tax is equal to the price times the sales tax rate

Sales tax = price * 5%

= 20 *.05

= 1.00

The total price is equal to the original price plus the sales tax

total price = price + sales tax

= 20+1

=21