100 руб---80%
хруб-----100%
х=100*100/80=125
можно100/80=1,25 руб- на 1%
1,25*100=125 руб
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100 руб---80%
хруб-----100%
х=100*100/80=125
можно100/80=1,25 руб- на 1%
1,25*100=125 руб