Question

A person lends Rs. 18,000 to a friend at a simple interest rate of 10% per annum. After 2 years and 6 months, the friend returns Rs. 12,000 and asks for an extension on the remaining amount. What is the new principal amount that the person will charge interest on for the next 6 months?

A 7800
B 8100
C 9400
D 10500
E 11000
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