Let the random variable $X$ represent the sales brought in. We are given the variance of sales: $Var(X) = 5,000,000$. The compensation $C$ is calculated as a constant base salary plus a proportion of sales: $C = 30,000 + 0.05 \cdot X$

Using the properties of variance, adding a constant does not change the variance, but multiplying by a constant scales the variance by the square of that constant: $Var(C) = (0.05)^2 \cdot Var(X)$ $Var(C) = 0.0025 \cdot 5,000,000 = 12,500$

The standard deviation is the square root of the variance: $\sigma_C = \sqrt{12,500} \approx 111.803$

Rounding to the nearest whole number gives \`112`$.