0.21875/2
    0.10625+11.25%
    7.5%*75%+5%
    7.5%*0.75*2/5+111.25%*3/5
    0.10625+11.875%
    7.5%*75%+5%
    （11.25%+12.5%）/2
    11.25%+12.5%
    （9%-4.5%）*1.5+4.5%
    （9%-4.5%）*1.5+4.5%
    （9%-4.5%）*1.5+5%
    （9%-4.5%）+5%+12.3%
    （9-4.5）+5%+12.3%=
    7.5%*0.75*2/5+12.4%*3/5
    12.5%+12.3%
    （9-3.8）*1.5+4.5
    7.5%*0.75*2/5+12.05%*3/5
    （9-3.8）*1.5+3.8
    1.75/（1+0.75*1）*（1+0.75*2/3）
    3.8+（6.5-3.4+7.6-3.6+8.3-4.3）/3

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