Question

Um capital de R$ 28.000,00, aplicado durante 8 meses, rendeu juros de R$11.200,00.
Determinar a taxa anual.

Answer 1

i=j*100/C/t
i=11200*100/28000/8*12
i=1120000/28000/8*12
i=40/8*12
i=5*12
i=60
Resposta: 60%a.a.