How can I buy something from the vending machine?

Hint 1 of 11:

The machine will only accept correct change.

Hint 2 of 11:

You must deposit all of the money together.

Hint 3 of 11:

Count the change Charles gave you when you paid for your room.

Hint 4 of 11:

You only have $2.50.

Hint 5 of 11:

The least expensive item sells for $2.75.

Hint 6 of 11:

Find another quarter near another vending machine.

Hint 7 of 11:

Have you visited Phil's Market yet?

Hint 8 of 11:

Look closely on the floor beside the drink machine.

Hint 9 of 11:

Pick up the coin.

Hint 10 of 11:

Put all your money in one pocket!