the no. of uniforms is 30
the bill of 30 uniforms included discount is 2992.50 $
let the total bill was x (without discount )
so the total bill will be
[tex]x-x\times\frac{5}{100}=2992.50[/tex][tex]\begin{gathered} \frac{95x}{100}=2992.50 \\ x=3150\text{ \$} \end{gathered}[/tex]so, the AMOUNT OF order before the discount was 3150 $