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1,2*80*x=64
96x=64
x=64/96
80x = 1,2×80x - 64
80x = 96x - 64
- 16x = -64 /:-16
x = 4
1,2×4 = 4,8
Odp: Sprzedawano po 4,8zł.
x-cena
80x - 1,2*80x = 64
80x-96x=64
x=4
4*0,2=0,8
4,8 sprzedawano