Sell 5 sweaters and 4 jackets. For sweaters, profit is 50%of the revenue. For jackets, profit is 40%
of the revenue. What is the revenue of 5 sweaters?
1) total revenues is some number.
2) total profit is some number.
选C. ~~By 要努力
楼主正解。条件一不充分,明显得不出毛衣的收入;条件二同样的不出来;条件一和二合起来可以联
立方程,可以求出来充分C