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x = 100 + 100 × 0,2
x = 100 + 20
x = 120
y = 200 - 0,25 × 200
y = 200 - 50
y = 150
120% ze 100 = 12/10 * 100 = 12 * 10 = 120
Odpowiedź: Szukana liczba to 120
25% z 200 = 1/4 * 200 = 500
200 - 50 = 150
Odpowiedź: Szukana liczba to 150