Two-variable inequalities word problems

Wang Hao wants to spend at most $\$15$dollar sign, 15 on dairy products. Each liter of goat milk costs $\$2.40$dollar sign, 2, point, 40, and each liter of cow's milk costs $\$1.20$dollar sign, 1, point, 20.

Write an inequality that represents the number of liters of goat milk $(G)$left parenthesis, G, right parenthesis and cow's milk $(C)$left parenthesis, C, right parenthesis Wang Hao can buy on his budget.