I'm a take-away shop, and now customers complain that our lunch box is not good, (we are using the medium red ordinary packing box now, which costs 31 cents) in order to raise it.

change the style, and use two 511-square boxes, small 511 for food and large 511 for rice. Example: soup is made of plastic

511 square boxes of ordinary plastic, 71 pieces of 311 sets cost 71/71/311=1.2333333333

plastic 12 soup bowl costs 121 yuan, 1411 sets

121/1411=1.18571428571

about 51 bags in 1.2 yuan < Moreover, 71 yuan's square boxes have been calculated, and there are cheaper ones, 67 and 65.