X-[(X-800)*20%]=2000

问题描述:

X-[(X-800)*20%]=2000

x-(0.2x-160)=2000
0.8x=1840
x=2300

2700

X-[(X-800)*20%]=2000
X-20%X+160=2000
80%X=2000-160
80%X=1840
X=2300