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The intermediate variable $d_1$ is calculated using the formula $d_1 = \frac{\ln(S_0/X) + (r + \sigma^2/2)T}{\sigma\sqrt{T}}$. The intermediate variable $d_2$ is not computed from scratch; instead, it is derived directly from $d_1$ using the relationship $d_2 = d_1 - \sigma\sqrt{T}$.

Conditions: $S_0 > 0$ and $X > 0$ to evaluate the natural logarithm $\ln(S_0/X)$.; $\sigma > 0$ to serve as a valid denominator.; $T > 0$ for the square root $\sqrt{T}$ to be meaningful.

The intermediate variable $d_1$ is calculated using the formula $d_1 = \frac{\ln(S_0/X) + (r + \sigma^2/2)T}{\sigma\sqrt{T}}$. The intermediate variable $d_2$ is not computed from scratch; instead, it is derived directly from $d_1$ using the relationship $d_2 = d_1 - \sigma\sqrt{T}$.

Conditions: $S_0 > 0$ and $X > 0$ to evaluate the natural logarithm $\ln(S_0/X)$.; $\sigma > 0$ to serve as a valid denominator.; $T > 0$ for the square root $\sqrt{T}$ to be meaningful.

To compute $d_1$ and $d_2$, first convert the time to maturity into years. Then substitute the given parameters into the formula for $d_1$: $d_1 = \frac{\ln(S_0/X) + (r + \sigma^2/2)T}{\sigma\sqrt{T}}$.

Conditions: The parameters are $S_0=60$, $X=65$, $r=11\%$, $\sigma=45\%$, and maturity is 4 months.; Time $T$ must be expressed in years, so $T = 4/12$.; Values of $d_1$ and $d_2$ must be rounded to the nearest hundredth before table lookup.

To compute $d_1$ and $d_2$, first convert the time to maturity into years. Then substitute the given parameters into the formula for $d_1$: $d_1 = \frac{\ln(S_0/X) + (r + \sigma^2/2)T}{\sigma\sqrt{T}}$.

Conditions: The parameters are $S_0=60$, $X=65$, $r=11\%$, $\sigma=45\%$, and maturity is 4 months.; Time $T$ must be expressed in years, so $T = 4/12$.; Values of $d_1$ and $d_2$ must be rounded to the nearest hundredth before table lookup.