Initial value ( V_0 = 20000 ).
After first 4 years at 6%: [ V_4 = 20000 \times (0.94)^4. ] [ (0.94)^2 = 0.8836,\quad (0.94)^4 = 0.78074896, ] [ V_4 = 20000 \times 0.78074896 = 15614.9792. ]
Next 6 years at 8%: [ V_{10} = V_4 \times (0.92)^6. ] [ (0.92)^2 = 0.8464,\quad (0.92)^4 = 0.71639296,\quad (0.92)^6 = 0.71639296\times 0.8464 \approx 0.606355. ] [ V_{10} \approx 15614.9792 \times 0.606355 \approx 9467.3. ]
Answer: Rs. 9467.30 (approx.)