Find the face value from banker’s gain: The banker’s gain on a bill due 1 year 4 months hence at 7.5% per annum (simple interest) is ₹16. Find the face value of the bill.

Difficulty: Easy

Correct Answer: Rs. 1760

Explanation:


Introduction / Context:
Banker’s Gain depends on the square of r t. With BG and r t known, the face value A is obtained directly from BG = A * (r t)^2 / (1 + r t).


Given Data / Assumptions:

  • t = 1 year 4 months = 16 months = 4/3 years
  • r = 7.5% = 0.075 per annum
  • Thus r t = 0.075 * (4/3) = 0.10
  • BG = ₹16


Concept / Approach:

BG = A * (r t)^2 / (1 + r t) ⇒ 16 = A * (0.10)^2 / 1.10


Step-by-Step Solution:

16 = A * 0.01 / 1.10 ⇒ A = 16 * 1.10 / 0.01 = 1760


Verification / Alternative check:
BD = A * r t = 1760 * 0.10 = ₹176; TD = BD − BG = 176 − 16 = ₹160; TD = A * 0.10 / 1.10 = ₹160 (consistent).


Final Answer:
Rs. 1760

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