400 ——— 100
x ——— 12
100x= 400•12
100x= 4800
x=4800/100
x=48 reais
400-48= 352 reais
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400 ——— 100
x ——— 12
100x= 400•12
100x= 4800
x=4800/100
x=48 reais
400-48= 352 reais