Bank A: 6% p.a. 1/2 yearly (CI) Bank B: x% p.a (SI) Bank C: 2x% p.a (SI) Let Raju invest $\Rs \P$ in bank B for $t \years$. Hence, Rupa invests $\Rs 10,000$ in bank C for $2t \years$. Now, $ \P{x/100} /t = \P (1 + 3/100)^2 -\P $ $ (x/100)/t = 1.0609 - 1 $ $ (\x/100) /t = 0.0609 $ We need to calculate SI $= 10000 × 2\t × ({2\x}/100) = 40000 (\x/100) \t = 40000 × 0.0609 = 2436 $