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Living with a long straddle · Part 3 of 4
You buy a one-month at-the-money straddle on a stock at $100 (strike 100, zero rates, 20% implied volatility) for $4.60. The straddle has gamma 0.138, vega 0.23 per volatility point and theta −0.076 per day.
On another day the stock does not move at all but implied volatility falls from 20% to 18%. Approximately what does the hedged straddle make that day?
Answer with a number. Fractions, powers and expressions like 23/6 or C(52,5) are read correctly in practice.
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