Question

uma pessoa deseja aplicar 580 a juros simples no fim de 3 messes obter 684,40. qual deve ser a taxa de juros?

Answer 1

Formula de juros simples

M=c.(1+i.n)

Substituindo

684,60=580.(1+3i)
684,60/580=1+3i
1,18=1+3i
3i=1,18-1
3i=0,18
i=0,18/3
i=0,06 x 100
i= 6%


Taxa de 6% ao mês

Answer 2

i=684,40-580*100/580/3
i=104,40*100/580/3
i=10440/580/3
i=18/3
i=6
Resposta: 6%a.m.