To calculate the total sales tax a customer will pay on both the large photo and the large frame, first, we need to determine the total cost before tax.
- Cost of the large photo: $50
- Cost of the large frame: $40
Now, sum these amounts:
\[ \text{Total cost before tax} = 50 + 40 = 90 \text{ dollars} \]
Next, we calculate the sales tax at a rate of 5%:
\[ \text{Sales tax} = \text{Total cost before tax} \times \text{Sales tax rate} \]
\[ \text{Sales tax} = 90 \times 0.05 = 4.5 \text{ dollars} \]
Thus, the total tax a customer will pay on both the large photo and the large frame is $4.50.