On what sum will the compound interest for 2 1⁄2 years at 10% amount to Rs. 31762.5? Options:
A) Rs.5000	B) Rs.20000	C) Rs.25000	D) Rs.30000	E) Rs.50000
Explanation:   P(1+10/100)^2×(1+1/2×10/100))=31762.5   P(11/10)^2×(21/20)=31762.5   P=31762.5×20×10×10/21×11×11=1512.5×20×10×10/11×11   =137.5×20×10×10/11   =12.5×20×10×10=Rs. 25000   Answer : Option Rs.25000
<result>C</result>
On what sum will the compound interest for 2 1⁄2 years at 10% amount to Rs. 31762.5?