Divide ₹ 2602 between M and N, so that the amount of M after 7 yr is equal to the amount of N after 9 yr, the interest being compounded at 4% pa.

Let the first part be ₹ M .
Then , second part = (2602 - M)
According to the question,
M(1 + 4/100)⁴ = (2602 - M) (1+4/100)⁹
⇒ M/(2602 - M) = [(1 + 4/100)⁹]/[(1 + 4/100)⁷]
⇒ M/(2602 - M) = (1 + 4/100)² = (26/25) x (26/25) = 676/625
⇒ 625M = 676 x 2602 - 676M
⇒ 1301M = 676 x 2602
∴ M = (676 x 2602)/1301 = 676 x 2 = 1352
∴ The two parts are ₹ 1352 and ₹ (2602 - 1352) = ₹ 1250