We have to calculate the total amount (T) she spent as follows:
[tex]T=222+278+167+333=1000[/tex]Therefore, 1000 is 100%.
Then, we have to build the following relation:
[tex]\frac{1000}{100}=\frac{278}{x}[/tex]Isolating for x:
[tex]10=\frac{278}{x}[/tex][tex]x=\frac{278}{10}=27.8[/tex]Answer: 27.8%