Rs. 25200 is invested in 3 parts in such a way that Simple Interest on 1st Part at 4% per annum for 3 years, Simple Interest on 2nd part at 6% per annum for 4 years and Simple Interest on 3rd Part at 8% per annum for 5 years are equal. Find each part.

Let the Principal for 1st part be A Principal for 2nd part be B Principal for 3rd part be C According to the question, (A ×4 ×3)/100= (B ×6 ×4)/100= (C ×8×5)/100 12A = 24B = 40C (LCM of 12, 24 and 40) = 120 12A /120= 24B/120 = 40C/120 A/10 = B/5 = C/3 So A:B:C = 10 : 5 : 3 A =10/18×25200= 14000, B ==5/18×25200= 7000 and C = =3/18×25200=4200

- A took a loan of Rs.5410 at simple interest of 15% p.a. and invested the same money in a scheme at simple interest of 25% p.a. Find the profit earned by A at the end of 2 years.
- Ajay invested Rs.a in SI at 7% rate of interest per annum for 12 years. Vishal invested the same amount in SI at 5% rate of interest per annum for 8 years and the difference between the interest obtained by Ajay and Vishal is Rs.2200. Find the amount invested by Vishal.
- Veeru invested Rs. 3100 at 20% p.a. simple interest for 3 years. After 3 years, he invested the amount received by him at the 20% p.a. compound interest, compounded annually for another 2 years. Find the final amount received by Veeru at the end of 5 years.
- What sum of money must be given at simple interest for 8 months at 4% per annum in order to earn Rs. 320 interest?
- On what sum will the difference between the simple and compound interest for 3 years at 20% percent per annum amounts to Rs 66.56?
- A certain sum of money invested at R% p.a. fetches a compound interest (compounded annually) of 1400 and simple interest of Rs.1250 at the end of 2 years. Find the value of ‘R’.
- Ajay invested Rs.a in SI at 7% rate of interest per annum for 10 years. Vishal invested the same amount in SI at 5% rate of interest per annum for 8 years and the difference between the interest obtained by Ajay and Vishal is Rs.2100. Find the amount invested by Vishal.
- A sum on simple interest becomes 9/4 times of itself in five years, find the rate of interest.
- Rs.5400 is divided into two parts such that if one part be invested at 6% and the other at 9%, the annual interest from both the investments is Rs. 435. Find each part.
- A certain amount earns simple interest of Rs. 1840 after 5 years. Had the interest been 4% more, how much more interest would it have earned?

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