Can you explain step by step on how to solve this

During its first month of operations, Perfect Pets purchased 5, 900 bags of dog food at a cost of $6 a bag and sold all 5, 900 bags of dog food on account with payment terms of $ 2/10, net 30 for $11 each. A total of 2, 700 of these bags were sold to customers who paid within the discount period: the other customers paid after the discount period had ended. Sales allowances totaling $220 were granted to customers whose dogs did not like the dog food. Required: a. Calculate the gross profit for the month. b. Calculate the gross profit percentage for the month. ((i. e., 0.1234 should be entered as 12.3)