20%x=(520-x)*12.5%,
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20%x=(520-x)*12.5%,
20%x=(520-x)*12.5%,
20%x=(520-x)*12.5%,
20%x=(520-x)*12.5%
0.2x=520*0.125-0.125x
0.325x=0.125*520
x=200
上式即:
0.2*x=0.125*(520-x)
0.2*x=65-0.125x
(0.125+0.2)x=65
0.325x=65
x=65/0.325
x=200