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29,40zł - x
29,40zł x 100% / 42zł = 70 %
Odp. Cene obniżono o 70% .
42 - 29,40 = 12,60
42 --- 100%
12,60 --- x %
z proporcji:
x = 12,60 razy 100 podzielić na 42 = 30 %
Obniżono cenę o 30 %.
29,40 - x
42x = 29,40 * 100%
42x = 2940 % /42
x = 70%