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1800-x
1600x=1800*100
1600x=180000|:1600
x=112,5%
20-100%
x-112,5
20*112,5=100x
2250=100x|:100
22,5=x
Odp. Corka dostaje teraz 22,5zl
1800 - x
1600x - 180000/1600 (skracamy zera)
x- 112,5%
112,5% - 100% = 12,5%
20 - 100%
x - 12,5
100x - 250/100
x - 2,5
20 + 2,5 = 22,5
Odp Córka dostaje 22,5 zl
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