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2014-05-08T16:42:11-03:00
Por regra de 3:
12.393 ---------- 108%
       x  ---------- 100%
x =  \frac{12393 * 100}{108} = 11475
12393 - 11475 = 918

Lucro= R$918,00
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2014-05-08T18:23:17-03:00
R$ 12.393,00⇒108%
X⇒ 8%
x*108 = R$ 12.393,00*8
x= 99.144,00/108
x= 918.
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