(c) Rs 2522
P = Rs 16000, r = 20% p.a. = 5% per quarter,
Time = 9 months = 3 quarters
\(\therefore\) A = 16000\(\big(1+\frac{5}{100}\big)^3\)
= 16000 x \(\big(\frac{21}{20}\big)^3\) = 16000 x \(\frac{21\times21\times21}{8000}\)
= Rs 18522
\(\therefore\) C.I.= Rs 18522 – Rs 16000 = Rs 2522.