Question

A=45000,N=3years,I=13500,R=?

Answer 1

Amount =45000
Time=3yr
Interest =13500

So principal =45000-13500

=31500

Si =prt/100

13500=31500x R x 3/100

R=13500 x100 /31500x3

=13500/315x3

R=4500/315=900/63=14 18/63%

=14.29%


If interest is compounded then

A=p(1+r/100)^N

45000=31500(1+R/100)^3

1.43=(1+r/100)^3

$1.43 = (\frac{100 + r}{100} ) {}^{3}$
1430000=(100+r)³

112.66=100+r

R=12.66

R=13% appox