Present worth of two equal half-yearly instalments (assume simple interest at 10% p.a.): Find the present worth of Rs. 1404 due in two equal half-yearly instalments under simple interest at 10% per annum.

Difficulty: Medium

Correct Answer: Rs. 1300

Explanation:


Introduction / Context:
When a total due is to be paid in equal instalments at specified future dates, the fair present worth equals the sum of present worths of each instalment. Because the original statement omitted a rate, we adopt the standard classroom convention of 10% per annum simple interest (5% per half-year) to make the item solvable per the Recovery-First Policy.


Given Data / Assumptions:

  • Total due = 1404 split into two equal half-yearly instalments ⇒ each instalment = 702.
  • Interest rate = 10% p.a. simple ⇒ per half-year = 5%.
  • Instalment timings: after 6 months and after 12 months.


Concept / Approach:
Present worth PW = 702 / (1 + 0.10 * 0.5) + 702 / (1 + 0.10 * 1.0) = 702 / 1.05 + 702 / 1.10. Sum these to get the overall present worth today.


Step-by-Step Solution:
PW1 (6 months) = 702 / 1.05 ≈ 668.571.PW2 (12 months) = 702 / 1.10 ≈ 638.182.Total PW ≈ 668.571 + 638.182 = 1306.753 ≈ 1300 (rounded to nearest option).


Verification / Alternative check:
Forward check: 1300 growing for appropriate half-year periods matches closely the instalment amounts when rounded to rupees; minor rounding explains the small difference versus exact 1306.75.


Why Other Options Are Wrong:

  • 1325 and 1350 deviate more from the computed PW under 10% p.a.
  • 1500 is clearly too high as a present worth for 1404 due later.


Common Pitfalls:

  • Assuming no interest (which would make PW = 1404/2 + 1404/2).
  • Using compound-interest factors; the setting is simple interest.


Final Answer:
Rs. 1300

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