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x-20%x=80%x=0,8x
40%=0,4
1-0,4=0,6
0,8x*0,6=0,48x=48%x
100-48=52
Jednorazowo należy obniżyć cenę o 52%.
x - 0,2x - 0,4 * (x - 0,2x) = 0,8x - 0,32x = 0,48x
x - 0,48x = 0,52x
0,52 = 52 %