Respostas

2013-08-29T00:35:46-03:00
O bem valia x. Desvalorizou 4,5%, passando a valer (1-0.045)x=0.955x. Desvalorizou 7.8%, passando a valer (1-0.078)0.955x=0.922*0.955x=0.88051x

Portanto, 0.88051x=781.23 => x=781.23/0.88051~=R$ 887,25