Pizza cost is rounded off

[aiden2480]

The cost of the order is being rounded off, ignoring when the pineapple and olives options are selected because they cost less than a dollar.

The error has been isolated to commits f712325, 6710256, & 884734e, though it was discovered in commit 0fa7dc3.
It arose when I changed the datatype of the monetary variables from Decimal to Integer.

Example: The topping pineapple does not affect the pizza cost as it is only 15c and is rounded down to zero. Similar errors occur with all toppings whose price is not a whole dollar.

[aiden2480]

All instances of Integer was replaced with Double. The changes were tested, and performed as expected.