EXERCISE 5 1. = (a) Find the amount when the principal is 5000 and the interest is 300. (b) If the amount is 76000 and the principal is *5400, what is the interest? (c) If the amount is 4500 and the interest is 500, what is the principal? 2. Find the simple interest on (1) *2750 for 6 years at the rate of 5% per annum. (ii) 3625 for 8 years at the rate of 6% per annum. (iii) *65 000 for 2 years 6 months at the rate of 4% per annum. 3. Find the amount in the following cases. (i) Principal = 2400, time = 7 years and interest rate = 6.5%. (ii) Principal 3500, time = 2 years and interest rate = 8%. 4. Find the sum of money on which the interest equals (1) 5700 in 3 years at the interest rate of 4% per annum. (ii) 13 875 in 5 years at the interest rate of 6% per annum. 5. In what time will (1) the interest on 26000 become 1200 at the rate of 5% per annum? (ii) 8500 amount to 15 385 at the interest rate of 9% per annum? 6. Find the rate of simple interest if (1) the interest on 4000 for 3 years is 600. (ii) the interest on 1000 for 5 years amounts to 300. 7. A farmer takes a loan of 8400 at the simple interest rate of 7 -% per annum. After what time will he have to pay 10 920 to clear the debt? 8. Samir borrows 360 000 from Rahim. He clears his debt by returning 64 000 to Rahim at the end of 12 months. Find the rate of interest charged by Rahim. 9. A man took a loan of 6 lakh from his friend at the simple interest rate of 9% per annum At the end of 3 years, he cleared his debt by paying 3 lakh and giving his flat to his friend. What was the price of the flat? 10. (a) Find the rate of interest if a sum of money gets doubled in 16 years. (b) Find the rate of interest if a sum of money gets doubled in 8 years.
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Step-by-step explanation:
1)A=p+l
=5000+300
=5300
2)S.I.=pxrxt/100
=3625×6×8/100
=1740
3)a=p(1+r/100)^t
=3500(1+8/100)^2
=3500x1.1664
=4082.4
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