Qual taxa nominal anual capitalizada mensalmente para a taxa efetiva de 10% em 60 dias

Vamos passar essa taxa efetiva em 60 dias para mês:

Daí, F(ao mês) = (1+i)^(1/2) - porque em 60 dias temos 2 meses.

F = (1,1)^(1/2) = 1,048  →  i = 0,048 , ou ainda, 4,88% ao mês

Logo, a taxa nominal anual capitalizada mensalmente é 4,88% * 12 = 58,57 % 

  i ef = [1,1^(1/2) - 1]^12 a.a. = 0,771561 a.a. 

---->>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 
0,771561 = (1 + i/12)^12

---->>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 

1,771561^(1/12) = 1 + i/12 

---->>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

1,048808848 = 1 + i/12 

---->>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

0,048808848 = i/12 

---->>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

i = 0,048808848*12 

---->>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

i = 0,5857 a.a.

---->>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

i = 58,57% a.a.*********** Pronto !