To solve this problem, we have to determine the 34.4% of 20. To find the x% of y, we can use the following expression:
[tex]y*\frac{x}{100}.[/tex]Therefore, the 34.4% of 20 is:
[tex]20*\frac{34.4}{100}=6.88.[/tex]Subtracting the above amount from20, we get:
[tex]20-6.88=13.12.[/tex]Answer:
The cheese bill decreased this week by
[tex]6.88\text{ dollars.}[/tex]The total cheese bill for this week is:
[tex]13.12\text{ dollars.}[/tex]