I need help show your calculation pleaseI need help show your calculation please

A restaurant had monthly purchases of $30,000 in March. The operation had an opening inventory of $5,200 and closing inventory of $9,400. It also offered employee meals valued at $1,200 and generated $2,800 from grease sales. a- What is the actual cost of sales? b-lf the restaurant had $80,000 in sales, what is the food cost percentage