30 points for 2 questions if you got the question correct I’m gonna give you brainlist

Olivia uses the work below to determine 55% of 720 which explains the error in olivia’s solution

If anyone has done the algebra 2 chaos theory portfolio would you be wiling to me? i kind of know what i'm doing i just don't know if i'm doing it right.

At the electronics store you have a coupon for 20% off up to 2 cds you buy for cds with the original cost of $10.99 each the sales tax is 5% what is the total cost of your purchase