M=C.(1+i)^t

11248,64=10.000.(1+i)³

11248,64/10.000=(1+i)³

1,124864=(1+i)³

1,04=1+i

1,04-1=i

0,04=i... ==> i=4 % a.m

M = C( 1 +i )^n

11.248.64 = 10.000 ( 1 +i)^ 3

( 1 +i)^3 = 11.248.64 /10.000

( 1 +i)^3 = 1,1248

³v(1+i)³ = ³V(1.1248)

1+i = 1.039

i =1,039 - 1

i =0.039

i =0.039 * 100 = 3.9 % ou 4 %