ANSWER
43.75%
Step-by-step explanation
We want to find the markup rate for the pair of shoes.
To do this, we have to find the difference between the different prices for the two weeks and then divide by the former price and multiply by 100 (per cent).
The difference in the two prices is:
115 - 80 = $35
Therefore, the mark up rate is:
![\begin{gathered} (35)/(80)\cdot100 \\ =\text{ 43.75\%} \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/8h1lqz80fjath3l28o7d7wka32k35ipns9.png)
That is the mark up rate.