 Principal:The money borrowed or lent out for a certain period is called the principal or the sum.
 Interest:Extra money paid for using other's money is called interest.
 Simple Interest (S.I.):If the interest on a sum borrowed for certain period is reckoned uniformly, then it is called simple interest.Let Principal = P, Rate = R% per annum (p.a.) and Time = T years. Then
(i). Simple Intereest = P x R x T 100 (ii). P = 100 x S.I. ; R = 100 x S.I. and T = 100 x S.I. . R x T P x T P x R
1. 
A sum of money at simple interest amounts to Rs. 815 in 3 years and to Rs. 854 in 4 years. The sum is:
 
Answer: Option C
Explanation:
S.I. for 1 year = Rs. (854  815) = Rs. 39.
S.I. for 3 years = Rs.(39 x 3) = Rs. 117.
Principal = Rs. (815  117) = Rs. 698.

2. 
Mr. Thomas invested an amount of Rs. 13,900 divided in two different schemes A and B at the simple interest rate of 14% p.a. and 11% p.a. respectively. If the total amount of simple interest earned in 2 years be Rs. 3508, what was the amount invested in Scheme B?
 
Answer: Option A
Explanation:
Let the sum invested in Scheme A be Rs. x and that in Scheme B be Rs. (13900  x).
28x  22x = 350800  (13900 x 22)
6x = 45000
x = 7500.
So, sum invested in Scheme B = Rs. (13900  7500) = Rs. 6400.

3. 
A sum fetched a total simple interest of Rs. 4016.25 at the rate of 9 p.c.p.a. in 5 years. What is the sum?
 
Answer: Option D
Explanation:

4. 
How much time will it take for an amount of Rs. 450 to yield Rs. 81 as interest at 4.5% per annum of simple interest?
 
Answer: Option B
Explanation:

5. 
Reena took a loan of Rs. 1200 with simple interest for as many years as the rate of interest. If she paid Rs. 432 as interest at the end of the loan period, what was the rate of interest?
 
Answer: Option B
Explanation:
Let rate = R% and time = R years.
12R^{2} = 432
R^{2} = 36
R = 6.

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