Explicação passo a passo:
aluguel antigo >>>>>>>>>>>>1 000 ou 100%
aluguel com aumento >>>>> 1 146,50
aumento >>>> 1 146,50 -1 000 = 146,50
1000 >>>>>>>>>>>>>>>100%
146,50 >>>>>>>>>>>>> x
1 000/146,50 = 100/x
emcruz
1 000 * x = 146,50 * 100
1000x = 14650
x = 14650/1000
x =14,65% >>>>>>>>resposta
