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381zł - x%
x=381zł*100%:2540zł=15%
Odp. Cenę komputera obniżono o 15%.
o = 381
c2 = c1-o
c2 = c1(100-x)%
c1-o = c1(100-x)%
(100-x)% = (c1-o)/c1
(100-x)% = 0.85
x = 15
381 : x
2540x=38100/:2540
x=15
odp cenę komputera obnirzono o 15%