Resposta:
Juros simples
J=V*i*n
2400=14400 * i * (2+1/2)
2400=14400 * i * (4/2+1/2)
2400=14400 * i * (5/2)
24=144 * i * (5/2)
i= 24*2/(144*5) ~0,0666666 ou 6,67% a.m.
Juros compostos
J= V*(1+j)^2,5 - V
2400= 14400 *(1+j)^2,5 - 14400
2400/14400 = (1+j)^2,5 - 1
2400/14400 +1 = (1+j)^2,5
1,16666666 = (1+j)^2,5
(1,16666666)^(1/2,5) = (1+j)
1,06360094 = 1+j
j= 0,06360094 ou 6,36% a.m.
