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IAI Actuarial Core Principles · Actuarial Mathematics for Modelling · Equation of value

A project requires an outlay of Rs 10,000 now and returns Rs 5,500 at the end of year 1 and Rs 6,050 at the end of year 2. What is the yield (internal rate of return) per annum effective?

The yield is 10.00% per annum. Discounting the two receipts at 10% gives Rs 5,000 each, which sums to the Rs 10,000 outlay, so the equation of value balances. Rates of 9% or 11% leave the present value of inflows above or below the outlay respectively.

  1. A8.50%
  2. B9.00%
  3. C10.00%Correct
  4. D11.00%
  5. 15.50%

Explanation

At i = 10%, PV of inflows = 5,500/1.1 + 6,050/1.21 = 5,000 + 5,000 = 10,000, which equals the outlay, so the equation of value is satisfied. At 9% the PV is about 10,138 and at 11% about 9,865, so neither balances. 15.50% is the total gain of Rs 1,550 as a percentage of the outlay, which ignores timing.

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