Answer :

[tex]4\frac{1}{8}=\frac{4\times8+1}{8}=\frac{32+1}{8}=\frac{33}{8}\\\\\\3\frac{1}{4}=\frac{3\times4+1}{4}=\frac{12+1}{4}=\frac{13}{12}[/tex]
4 1/8=(8*4+1)/8=33/8

3 1/4=(4*3+1)/4=13/4

the formula is : a b/c=(c*a+b)/c