Question

商店某种货物的进价下降了8%,但销售价不变,于是这种货物的销售利润

Answer 1

选 B.15

-------------------------------------过程

以原进价为单位1, 则销售价为1+ r%

(1+r%-(1-8%))/(1-8%)=(r+10)%

(r%+8%)/92%=(r+10)%

r+8=(r+10)*92%

r+8=0.92r+9.2

0.08r=1.2

r=15