Question

Um capital de R$ 16.000,00, aplicado durante 8 meses, rendeu de juros R$ 1.920,00. Determine a taxa anual de juros simples.

Answer 1

J=c.i.t
J=juros
C= capital
i=taxa
t=tempo

1920=1600.i.8

1920=12800i

i=1920/12800

i=0.15

Answer 2

i=j*100/C/t

i=1920*100/16000/8*12
i=192000/16000/8*12
i=12/8*12
i=1,5*12
i=18
Resposta: Taxa de 18%a.a.