RRB Assistant Loco Pilot and Technician Model Paper 16 with key

Question : 52 of 75

Marks: +1, -0

The simple interest on a certain sum for 8 months at 4% per annum is Rs. 129 less than the simple interest on the same sum for 15 months at 5% per annum. The sum is:

Rs. 2580
Rs. 2400
Rs. 2529
Rs. 3600

Validate

Solution:

Let the sum = Rs. P, then

T_1

8/{12}

years and

T_2

{15}/{12}

years
According to the question

{P×5×15}/{100×12}

{P×4×8}/{100×12}

= 129

{43P}/{1200}

= 129
⇒ P = Rs. 3600

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