Help with the Business Students Society please!

(The green answers are correct and the red ones I need help on. The gross profit percentage is calculated from the totals in Part 1 (the first picture), so it is needed to be completed first.

9 Required Information The following information applies to the questions displayed below] a. on October 1, the Business Students' Soclety (BSS) placed an order for 210 golf shits at a unit cost of $30, under terms 2/10, n/30. The order was recelved on October 10, but some golf shirts differed from what had been ordered. Uncertain whether the shirts would be returned or kept, BSS decided to record any purchase discount only when taken (using the gross method). c On October 11, 60 golf shirts were returned to the supplier. d On October 12, BSS complained the remaining golf shirts were slightly defective so the supplier granted a $200 allowance. e BSS pald for the golf shirts on October 13. f During the first week of October, BSS recelved student and faculty orders for 190 golf shirts, at a unit price of $71, on terms 2/10. n/30. g The golf shirts were delilvered to these customers on October 18. Unfortunately, customers were unhappy with the golf shirts, so BSS permitted them to be returned or given an allowance (see h and h Uncertain whether customers would keep or return the shirts, BSS decided to record any sales discount only when taken (using the gross method). L On October 19, one-half of the golf shirts were returned by customers to BSS / On October 20, an allowance was given on account equal to $23.00 per shirt for the remaining 95 shirts. k. The customers paid their remaining balances on the last day of the month, October 31