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ACCA Strategic Professional · Advanced Financial Management · Application of option pricing theory in investment decisions

A European call has share price 100, exercise price 100, risk-free rate 5% per year (continuously compounded), volatility 20% per year and one year to expiry. What is the value of d2 in the Black-Scholes model?

d2 is 0.15. First compute d1 as (0 + 0.05 + 0.02) divided by 0.20, which gives 0.35. Then subtract volatility times the square root of time, 0.20, to get d2 of 0.15.

  1. A0.15Correct
  2. B0.35
  3. C0.05
  4. D0.55

Explanation

d1 = [ln(100/100) + (0.05 + 0.5 × 0.2²) × 1] / (0.2 × 1) = 0.07/0.20 = 0.35. d2 = d1 − σ√T = 0.35 − 0.20 = 0.15. The figure 0.35 is d1 itself. The figure 0.05 comes from omitting the σ²/2 term in d1 (0.25) and then subtracting 0.20. The figure 0.55 comes from adding σ√T instead of subtracting it.

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