Question

In what time will principal of rupees 3200 at rate of 8% become Rs3840

Answer 1

A = P + SI

3840 = 3200 + SI

SI = 640

SI = P.R.T/100

640 = 3200.8.T/100

T = 100 / 40

T = 2.5 years

Answer 2

Given :

Principal = Rs.3200

Rate of interest = 8%

Amount = 3840

To Find :

In what time will principal of rupees 3200 at rate of 8% become Rs3840

Solution:

Principal = Rs.3200

Rate of interest = 8% = 0.08

Amount = 3840

Formula :$A=P(1+r)^t$

$3840=3200(1+0.08)^t$

$\frac{3840}{3200}=1.08^t$

t=2.36

Hence The time will be 2.36 years