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400/(1+10%)+300/(1+10%)2+300/(1+10%)3=836.96怎么算出来836.96元,请给一下演变流程

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400/(1+10%)+300/(1+10%)2+300/(1+10%)3=836.96怎么算出来836.96元,请给一下演变流程
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答案和解析
下面是
400/(1+10%) 363.64
+300/(1+10%)2 247.93 (1+10%)2 相当于(1+10%)的平方
+300/(1+10%)3 225.39 (1+10%)3 相当于(1+10%)的立方
=836.96