Q.Find the present value of an annuity of ₹2,000 payable at the end of each year for 3 years, if money is worth 5% per annum compounded annually.
Concept understanding — Present Value of an Annuity
The present value of an ordinary annuity, V=P[i1−(1+i)−n], is the lump sum today that is exactly sufficient to fund a future stream of equal instalments — the basis of loan/EMI calculations, where solving for P given a known V gives the instalment amount.
The present value is the single sum today equivalent to the three future payments, found by discounting each back to the present with the present-value annuity factor.
V=Pdfrac1−(1+i)−ni=2000timesdfrac1−(1.05)−30.05.
With (1.05)−3=0.863838, the annuity factor is 2.72325, so the present value is 2000times2.72325.
The present value is ₹5,446.50 (approximately).
Method 1 — Present-value annuity formula.
P=2000, i=0.05, n=3.
V=Pleft[dfrac1−(1+i)−niright]=2000left[dfrac1−(1.05)−30.05right]
(1.05)−3=dfrac11.157625=0.863838;Rightarrow;dfrac1−0.8638380.05=dfrac0.1361620.05=2.72325
V=2000times2.72325=5446.50
The present value of the annuity is ₹5,446.50 (approximately), confirmed below by discounting each payment separately.
Method 2 — Discount each payment individually (cross-check).
| Year | Payment | Discount factor (1.05)−t | Present value |
|---|---|---|---|
| 1 | 2000 | 0.952381 | 1904.76 |
| 2 | 2000 | 0.907029 | 1814.06 |
| 3 | 2000 | 0.863838 | 1727.68 |
| Total | 5,446.50 |
1904.76+1814.06+1727.68=5446.50, matching the formula — the present-value annuity factor is exactly the sum of the individual discount factors.
A frequent error is to use (1+i)n instead of (1+i)−n in the present-value factor, effectively computing a future value instead of discounting. Present value always discounts future payments to a smaller figure today; a present value larger than the total of the payments (₹6,000 here) is an immediate sign the sign of the exponent has been mistaken.
- CBSE 2025Set ANNUAL1 markMCQQ.In an ordinary annuity, payments or receipts occur at ______.(a) Beginning of each period(b) End of each period(c) Mid of each period(d) Quarterly basis
›Reveal solutionSolution
By definition, an ordinary (immediate) annuity is one in which the equal payments or receipts occur at the end of each period; if they occurred at the beginning it would be an annuity due.
An annuity is a sequence of equal payments made at regular intervals. The classification depends on the timing of each payment within its period:
- Ordinary / immediate annuity — the payment is made at the end of each period (e.g. loan EMIs, most rent-type receipts recorded at period end).
- Annuity due — the payment is made at the beginning of each period.
The question refers to an ordinary annuity, so the payments or receipts occur at the end of each period. The other choices (mid of each period, quarterly basis) are not standard classifications for this definition.
✓Final answerOption (B) End of each period.
- CBSE 2024Set ANNUAL1 markMCQQ.In an ordinary annuity, payments or receipts occur at ______.(a) Beginning of each period(b) End of each period(c) Mid of each period(d) Quarterly basis
›Reveal solutionSolution
By definition, in an ordinary annuity each payment or receipt is made at the end of every period — option (b). (When payments are made at the beginning of each period it is called an annuity due.)
An annuity is a sequence of equal payments made at regular intervals of time. Annuities are classified by when within each period the payment occurs:
- Ordinary annuity (immediate annuity): each payment is made at the end of the period.
- Annuity due: each payment is made at the beginning of the period.
The question asks about an ordinary annuity, so the payments/receipts occur at the end of each period. The remaining options — beginning of each period (that is an annuity due), mid of each period, and quarterly basis (which describes only the frequency, not the timing within a period) — do not define an ordinary annuity.
✓Final answerIn an ordinary annuity, payments or receipts occur at the end of each period — option (b).
- CBSE 2023Set ANNUAL1 markMCQQ.______ is a series of constant cash flows over a limited period of time.(a) Perpetuity(b) Annuity(c) Present value(d) Future value
›Reveal solutionSolution
A sequence of equal payments made at equal time intervals for a fixed (limited) number of periods is an annuity; only if it continued indefinitely would it be a perpetuity. Hence option (B).
Comparing the choices:
-
Perpetuity — equal cash flows that continue for an unlimited (infinite) time, so it is ruled out by the word "limited period."
-
Annuity — a series of constant (equal) cash flows made at regular intervals for a limited, definite number of periods. This exactly matches the description.
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Present value and Future value are single amounts (the discounted or accumulated worth of the flows), not the series itself.
✓Final answerThe correct option is (B) Annuity.
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