Aptitude

1

The rate at which a sum becomes four times of itself in 25 years at S.I.,will be:

a

30%

b

25%

c

12%

d

49%

Let sum = x. Then, S.I. = 3x

Rate = [100 ** (S.I.) / P**T] %

= [100 ** (3x) / x ** 25]% = 12%

2

What annual installment will discharge a debt of Rs 1092 due in 3 years at 12% simple interest?

a

325

b

545

c

560

d

550

Let each instalment be Rs.x .

Then, [x + (x ** 12 ** 1)/100] + [ x + (x **12 ** 2)/100] + x =1092

$\inline \Leftrightarrow$ ( (28x)/25 ) + ( (31x)/25 ) + x = 1092

$\inline \Leftrightarrow$ (28x + 31x + 25x) = (1092 ** 25)

$\inline \Leftrightarrow$ x = (1092 ** 25)/84= 325

$\inline \therefore$ Each instalment = Rs. 325