6. If the amount is 2 ¼ times the sum after 2 years at compound interest, find the rate of
interest per annum.
7. Find the time in which Rs. 1800 amounts to Rs.2178 at 10% per annum, compounded
annually.
8. If 8 oranges cost Rs.52, how many oranges can be bought for Rs.169?
9. 6 pipes fill a tank in 120 minutes, then 5 pipes will fill it in
(a) 100min (b) 144min (c) 140min (d) 108min
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Answer:
2178 = 1800(1+10/100)^n (The formula is P(1+r/100)^n)
2178/1800 = (1+10/100)^n
121/100 = (11/10)^n
(11/10)^2 = (11/10)^n
n = 2.
Step-by-step explanation: