The Question was to long to put in the title

Question

A sofa sells for 750.00. it is on sale at a discount of 20%. Ms.Watson has saved $500 enough money to buy this sofa. Has she saved enough money to buy this sofa. has she saved enough money to buy this sofa? If not, how much more money does she need?

Answer 1

Since it is discounted 20%, that means the selling price is 80% or 0.8 of what it originally was.

750 * 0.8 = 600

So, Ms. Watson needs to save another $100 and hope the sofa is still on sale when she's done so.