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900*10%==90
900+90=990
990*20%=198
990+198=1188
900-------100%
1188-------x%
x=1188*100:900
x%=132%
zatem wzrosła o 32%
900 + 90 = 990
990 * 20 / 100 = 198
990 + 198 = 1188
1188 - 900 = 288
288 / 900 * 100 = 32 %
spr.
900 * 32 / 100 = 288
900 + 288 = 1188
zgadza się :)