Because the exchange cost is required to be controlled within 8.20 yuan, that is, the exchange cost is less than or equal to 8.20 yuan.

Exchange cost = total cost of exporting RMB/net foreign exchange income

(1) Total export cost = 450 *1000+450 *1000 *15%-25000 = 492500.

(2) Exchange cost ≤ 8.2 = 492,500 /FOB price, FOB≤60060.96 USD.

(3)C2 FOB% = FOB/(1-2%) = 61286.71USD.

Then per unit FOB C2% = 61286.711000 boxes = 6 1.25438+0 USD/box.

These figures are somewhat different. I wonder if it's the same question.