Question

determine a taxa mensal de juros simples pela qual certo capital aplicado durante um ano :
duplica de valor
triplica de valor

Answer 1

 considerando  j= c*t *i/100       

 capital = 1

 tempo = 12 meses

 taxa = i

 juro ----------------->equivalendo dobro

                                   2=12 * 1 *i/100

                                   2 =12 i/100

                                   i= 16,66%

 equivalendo o triplo   ------> 3 =1 *12*i/100

                                                3=12i/100

                                               i= 300/12

                                               i= 25%