Assume both 1) and 2) are 16 ounce beverages.
1) hot coffee = $1.80
2) iced coffee = $2.30
Let me rephrase:
1) coffee + paper cup = $1.80
2) coffee + plastic cup + ice = $2.30
This means that
plastic cup + ice - paper cup = $2.30 - $1.80 = $0.50
In English, the cost of ice and the cost of using a plastic cup instead of paper is $0.50. But wait, there's more: there is less coffee in the iced coffee since ice replaces roughly 50% of it!
Okay, so this means:
1) 1.0*coffee + paper cup = $1.80
2) 0.5*coffee + plastic cup + ice = $2.30
Thus:
plastic cup + ice = $0.50 + 0.5*coffee
Lets go out on a limb and say that the paper cup costs $0.80, which is probably an extreme upper bound. This makes the equations a bit easier:
1) 1.0*coffee + $0.80 = $1.80 :: 1.0*coffee = $1.00
2) 0.5*coffee + plastic cup + ice = $2.30
:: $0.50 + plastic cup + ice = $2.30
:: plastic cup + ice = $1.80
This is friggin' ridiculous. There's no way that a cup costs more than a dollar, you can get a pack of 1000 of the exact cup I'm drinking from for $120; that's twelve cents each. That means that the ice must cost $1.68!!! There's no way it costs that much to make ice, especially when you use it in frappés all day and make it in bulk.
I hope the owner of Java Haute reads this.