Question

Mr. Khalid invested Rs. 200,000 at 12% simple interest and Rs. 189,744 at 14% simple interest. The two
amounts were left to grow till such time that the total of interest and principal of both investments become
equal

Answer 1

Answer:

Mr. Khalid invested Rs. 200,000 at 12% simple interest

$A1 = P (1+R*T/100) \\ = 20000(1 + 12 \times \frac{t}{100} )$

and Rs. 189,744 at 14% simple interest.

$A1 = P (1+R*T/100) \\ = 20000(1 + 12 \times \frac{t}{100} )$

Simple Interest :

$SI=P*R*T/100$

and total amount with Principle and Interest :

$A = P (1+R*T/100) \\ \\ = P + SI$

As per the question,

SI = P

$A = P (1+R*T/100) \\ \\ = P + SI \\ 2P = P (1+R*T/100) \\ 2 = 1 + R*T/100$