Respostas

2014-04-11T14:33:48-03:00
M=C+J

J=C.i.t

280000=C+C.i.4280000=C.(1+4i)C= \frac{280000}{1+4i}

400000=C+C.i.10400000=C.(1+10i)C= \frac{280000}{1+4i}=\frac{400000}{1+10i}

\frac{7}{1+4i}=\frac{10}{1+10i}

7.(1+10i)=10.(1+4i)

7+70i=10+40i

30i=3

i= \frac{3}{30} = \frac{1}{10} = \frac{10}{100} =10 % a.m. = 12.10=120 % a.a.

C= \frac{280000}{1+4.(0,1)}= \frac{280000}{1+0,4}= \frac{280000}{1,4}= \frac{2800000}{14}=200000 reais