On a certain sum of money compound interest earned at the end of three years Rs 1456 Compound intere...........

Explanation:

Let principal = P, rate of interest = r %
CI earned at the end of three years = P(1 + r)³ - P = 1456
=> P(3r² + 3r + r³) = 1456
CI earned at the end of two years = P(1 + r)² - P = 880
=> P(r² + 2r) = 880

Rs. 2,000 is the principal amount.