Rs. 1,000 is invested at 5% per annum simple interest. If the interest is added to the principal after every 10 years, the amount will become Rs. 2,000 after

Explanation:

Principal = Rs.1000, Rate = 5%

Interest for first 10 years

=1000×5×10\100=Rs. 500

After 10 years principal = (1000+500)= Rs. 1500

Remaining interest =(2000−1500)= Rs.500

Required time

=500\1500×100\5=100\]15=20\3=6 2\3years

Total time=(10+6 2\3)years

=16 2\3 years