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115 x = 13800 / :115
x = 120
spodnie kosztowały 120 zł :)
100% - x
x=(100% × 138 [zł]) ÷ 115%
x=120 [zł]
Odp.: Cena początkowa spodni to 120 złotych.
115% - 138zł
100% - x
115%x= 138 * 100%
115%x= 13800//:115%
x= 120 zł