Find the C.I. on a sum of Rs.10000 for 6 months at 25% per annum, interest being compounded quarterly? Select:
A) 10290
B) 5290
C) 1289
D) 1290
E) 2290

Rationale: c . i . = 2000 ( 21 / 20 ) ^ 2 - 1800 = 1289 answer : c
Answer: C