A man invested Rs. 10800 at the rate of 7.5% p.a. for two years on SI and Rs. ‘P’ at the rate of 20% p.a. for two years on CI. If ratio of total SI received by man to total CI received by man in second year is 9 : 10. Find ‘P’.

Correct option is D

Total SI received by man = 10800 ×(7.5 ×2 )/100 = 1620 Rs.
Total CI received by man for second year = 1620 ×10/9=1800 Rs.
Total CI received by man for second year = 20 + (20 ×20)/100 = 24%
P = 1800 ×100/24=7500 Rs