Inequalities&linear program

A company produces two brands, A and B , of mixed nuts by putting peanuts and almonds together . A packet of brand A mixed nuts contains 40g of peanuts and 10g of almonds. A packets of brand B mixed nuts contains 30g of peanuts and 25g of almonds. The company has 2400kg of peanuts , 1200 kg of almonds and 70 carton boxes.Each carton box can pack 1000 brand A packets or 800 brand B packets.

The profits gennerated by a box of brand A mixed nuts and a box of brand B mixed nuts are$800 and $1000 respectively. suppose x boxes of brand A mixed nuts and y boxes of brand B mixed nuts produced.

它每一包nuts的單位是 packet , 但它設x,y的單位是box . 那如何set constraints?
請幫我找出constraints (請解釋)
及objective function是否 P=800x+1000y?

謝謝您