400р -100%
400/100=4р -1%
5%=5*4=20
400+20=420
420 - 100%
420/100=4,2 -1%
4,2*10=42 -10%
420+42=462р
Ответ:462
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400р -100%
400/100=4р -1%
5%=5*4=20
400+20=420
420 - 100%
420/100=4,2 -1%
4,2*10=42 -10%
420+42=462р
Ответ:462