成本20卖100利润是多少

简介：Qin Fen weighed it in his mind and found that the advantage of gunners was far greater than that of mechas. The most important point was that firearms were not as expensive as mechas. In addition, the energy bullets of firearms did not need to be purchased. Mechas could only be charged by solar energy. It is slow, mainly relying on energy blocks, and ordinary people cannot afford it.