Calculate the compound interest for the second year on ₹ 15,000 invested for 5 years at 6% per annum.

For 1st year:

P = ₹ 15,000

R = 6%

T = 1 year

$\text{Interest} = \Big(\dfrac{P \times R \times T}{100}\Big)\\[1em] = ₹ \Big(\dfrac{15,000 \times 6 \times 1}{100}\Big)\\[1em] = ₹ \dfrac{90,000}{100}\\[1em] = ₹ 900$

And

$\text{Amount = P + Interest}\\[1em] = ₹ 15,000 + 900\\[1em] = ₹ 15,900$

For 2nd year:

P = ₹ 15,900

R = 6%

T = 1 year

$\text{Interest} = \Big(\dfrac{P \times R \times T}{100}\Big)\\[1em] = ₹ \Big(\dfrac{15,900 \times 6 \times 1}{100}\Big)\\[1em] = ₹ \dfrac{954,000}{100}\\[1em] = ₹ 954$

Hence, compound interest = ₹ 954.