hope all is well during this time, well working on this assignment I had difficulty understanding this concept

4. For a 4th of July promotion, 20 swimsuits were marked down from $100 to $65. During the sale, 10 swimsuits were sold. After the sale, the remaining 10 swimsuits were re- marked to the original 5100 price and sold. Determine the total markdown, markdown cancellation, and net markdowns. For a back-toschool sale, 120 shirts were received from the vendor. The shirts turned out to be a hot-selling item and 40 of the shirts were sold before the sale at the original retail price of 585. Then, 80 shirts were marked down to $69.99 to drive traffic into the store for the promotion. 68 shirts sold during the sale. The remaining shirts were marked back up to $75 and were sold at that price. Determine the net markdown %