To calculate the commission pay for the week, you can use the formula:
\[ \text{Commission} = \text{Total Sales} \times \text{Commission Rate} \]
In this case, the total sales are $26,300, and the commission rate is 4%, which can be expressed as a decimal (0.04).
Now, plug in the values:
\[ \text{Commission} = 26,300 \times 0.04 \]
Calculating this gives:
\[ \text{Commission} = 1,052 \]
Therefore, his commission pay for that week is $1,052.