whatever% of anything is just (whatever/100) * anything.
let's first convert the mixed fraction to "improper" and then divide it by 100 to make decimal.
[tex]\bf \stackrel{mixed}{8\frac{1}{4}}\implies \cfrac{8\cdot 4+1}{4}\implies \stackrel{improper}{\cfrac{33}{4}}
\\\\\\
\stackrel{\%}{\cfrac{33}{4}}\implies \cfrac{\quad \frac{33}{4}\quad }{100}\implies \cfrac{\quad \frac{33}{4}\quad }{\frac{100}{1}}\implies \cfrac{33}{4}\cdot \cfrac{1}{100}\implies \cfrac{33}{400}\implies \stackrel{decimal}{0.0825}[/tex]
