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With zero rates, Black–Scholes theta is $\Theta = -\tfrac{1}{2}\sigma^2 S^2\Gamma$ . For a one-year at-the-money call on a $\$100$ stock at $20\%$ volatility, gamma is $0.01985$ . What is theta per year, to two decimals? (Give a signed number.)

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With zero rates, Black–Scholes theta is Θ=−12σ2S2Γ\Theta = -\tfrac{1}{2}\sigma^2 S^2\GammaΘ=−21​σ2S2Γ. For a one-year at-the-money call on a $100\$100$100 stock at 20%20\%20% volatility, gamma is 0.019850.019850.01985. What is theta per year, to two decimals? (Give a signed number.)

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With zero rates, Black–Scholes theta is $\Theta = -\tfrac{1}{2}\sigma^2 S^2\Gamma$ . For a one-year at-the-money call on a $\$100$ stock at $20\%$ volatility, gamma is $0.01985$ . What is theta per year, to two decimals? (Give a signed number.)