Can someone help me find the coordinates for A, B and E? (it’s multiple choice)

Toyland is having a sale. all items are 20% off. how much will you save on an item that usually sells for 95$ explain your

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )

How many 3/8s are in 6 plz someone tell me now