Answer:
Therefore, we conclude that William left 90.9% of an ounce of his coffee.
Explanation:
We know that William has a 22 ounce coffee. He drinks 2 ounces. We calculate percentage of ounces William has left of his coffee.
We get 22-2=20 ounce coffee.
We have the following proportion:
![22:100\%=20:x\%\\\\22x=20\cdot 100\\\\x=(2000)/(22)\\\\x=90.9\%](https://img.qammunity.org/2021/formulas/mathematics/high-school/4m60azbipx046twqcfzt19xn4gxxjbpvyf.png)
Therefore, we conclude that William left 90.9% of an ounce of his coffee.