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[510*(1-4%)-(400-X)]*(1+10%)*m=(510-400)*m

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答案和解析
[510*(1-4%)-(400-X)]*(1+10%)*m=(510-400)*m
→ [510*(1-4%)-(400-X)]*(110m/100)=110m
→ [510*(1-4%)-(400-X)]*(1/100)=1
→ 510*(1-4%)-(400-X)=100
→ 510-510*4%-400+X=100
→ X=510*4%-10
→ X=10.4