Isaac created the following table to figure out a mixture problem.

	Total cost ($)		Price ($/pound)		Amount of candy (pounds)
Lollipops	$\displaystyle{0.5}{\left({p}+{0.75}\right)}\usepackage{cmbright}\Huge\$	=	$\displaystyle{p}+{0.75}\usepackage{cmbright}\Huge\$	*	0.5
Gumballs	$\displaystyle{2}{p}\usepackage{cmbright}\Huge\$	=	$\displaystyle{p}\usepackage{cmbright}\Huge\$	*	2
Combo	10.00	=		*	2.5

If the table is a correct representation of the problem, which of the following problems was he solving?