DRDO Multi tasking staff Model paper 7

Let the principal = Rs. 100
Now, S.I. on Rs. 100 = PTR/100
⇒

100×5×3

100

= Rs.15
Thus, S.I. on Rs. 100 = Rs. 15
⇒ Now, C. I. on Rs. 100 = P (1+

x

100

)2 _ P
⇒ 100 (1+

5

100

)3 _ 100 = Rs.15.7625
⇒ C.I. on Rs. 100 = Rs. 15.762
Now, the difference of C.I. and S.I. = 15.7625 – 15 = 0.7625
⇒ For Rs. 100 the difference in C.I. and S.I. is Rs. 0.7625
⇒ For Rs. X the difference in C.I. and S.I. is Rs. 366
⇒ X =

100×366

0.7625

= Rs.48000
∴ On Rs. 48000, the difference of compound and simple interest, shall come out to be Rs. 366