A certain sum of money is given at a certain rate of interest for 8 years. If rate of interest would have been 10.5% more, then Rs 2100 more interest would be received. Then find the principal.

2000 2400 2500 3000

2500

Extra Benefit = 10.5% × 8 = 84% 84% = \(\frac{21}{25}\) = \(\frac{S.I.}{Principal}\) 21R = 2100 (given) 1R =100 Hence, Principal = 25R = 25 × 100 = 2500