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9zł=100%-30%-25%
9zł= 45%
45% - 9zł
100%- x
x= (100%*9zł)/ 45%= (20%*9zł)/9%= 20zł.
Prezent kosztował 20zł.
9zł= x- 55/100x
9zł= 45/100x
x= (9*100): 45= 20 zł