1) If a 4 pack costs $ 0.36 to find the unit price we can set a proportion, and then cross multiply
4 marbles --------------------- 0.36
1 marble ------------------------ x
[tex]\frac{4}{1}=\frac{0.36}{x}[/tex]4x=0.36 Divide both sides by 4
x= 0.09
So, the unit price is $0.09 per marble
