We have to calculate the percentage change of the first quantity with reference to the second quantity.
The quantities are:
![\begin{gathered} X_1_{}=480 \\ X_2=560 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/wytwd3m1ardujm4xow81f9ixvj86vj4uzr.png)
We then can calculate the percentage change as:
![\begin{gathered} p=(480-560)/(560)\cdot100\% \\ p=(-80)/(560)\cdot100\% \\ p=-0.1429\cdot100\% \\ p=-14.29\% \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/gg0p8gxvl4knsm497je3ykmor3jr53kluc.png)
Answer: the percentage change of the first quantity with reference to the second quantity is -14.29%.