Resposta :
Dados:
[tex]C=\text{R\$500,00}\\ M=\text{R\$800,00}\\ t=8\ \text{meses}[/tex]
Explicação passo-a-passo:
[tex]\boxed{M=C(1+i)^t}\ \therefore\ 800=500(1+i)^8\ \therefore[/tex]
[tex]\dfrac{8}{5}=(1+i)^8\ \therefore\ 1+i=\sqrt[8]{\dfrac{8}{5}}\ \therefore\ \boxed{i=\sqrt[8]{\dfrac{8}{5}}-1\ \text{a.m.}}[/tex]
[tex]\boxed{i\approx6.05\%\ \text{a.m.}}[/tex]
Letra B.