__AFB Last Minute Revision__

Paper I

Paper I

Let the present worth be Rs.x

Then, S.I.= Rs.(132 - x)

=› (x*5*2/100) = 132 - x

=› 10x = 13200 - 100x

=› 110x = 13200

x= 120

2. Find the rate at Simple interest, at which a sum becomes four times of itself in 15 years.

Let sum be x and rate be r%

then, (x*r*15)/100 = 3x [important to note here is that simple interest will be 3x not 4x, because 3x+x = 4x]

=> r = 20%

3. Effective annual rate of interest corresponding to nominal rate of 6% per annum compounded half yearly will be ?

Let the amount Rs 100 for 1 year when compounded half

yearly, n = 2, Rate = 6/2 = 3%

Amount=100(1+3100)2=106.09

Effective rate = (106.09 - 100)% = 6.09%

.4 A sum of money invested at compound interest to Rs. 800 in 3 years and to Rs 840 in 4 years.

The rate on interest per annum is. S.I. on Rs 800 for 1

year = 40

Rate = (100*40)/(800*1) = 5%

5. Principal: 'P' = Rs. 50,000, Interest rate: 'R' = 10% = 0.10, Repayment time: T = 3 years. Find the amount of interest paid.

Interest = PRT

= 50,000x0.10x3

= Rs. 15,000/-

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