Question

O capital de R$ 1.600,00, aplicado a juros compostos, rendeu, após 3 meses, juros de R$ 158,65. Qual foi a taxa de juros?

Answer 1

M = 1600 + 158,65 = 1758,65

M = C * (1 + i)t

1758,65 = 1600 * (1 + i) ³

1758,65 / 1600 = (1 + i) ³

i = (³√1758,66/1600) -1

i = (³√1,099156250) -1

i = 1,032016113 -1

i = 0.032016113 * 100

i = 3.2016113% a.m

i = 3.20% a.m