My problem is with constraints.

Here is the problem in a nutshell

1000 guests in a fundraiser. $1 for juice $1.75 for Soda

Constraints:

each drink has to be served in an unused plastic cup of which there are 5,000

juice must acount for at least 30% of drinks served

each guest can only have 3 sodas

each juice must have 2 icecubes and each soda must have 4 ice cubes, there are 15,000 icecubes available.

goal is to maximize profit

I know the objective function is going to be 1x+1.75y=z

I think one constraint is going to be y less than/equal to 3 and after that i get lost. please help