The deposit is usually the daily hire rate rounded up to the nearest ten. So if the daily hire rate is $95, the deposit would be $100 and the total amount payable will be $195. The full deposit is refundable when you bring the equipment back in good working condition.
Deposits are refunded using the same method by which payment was made. So if you paid the hire rate and deposit on a credit card, you will need to bring the same credit card back to be issued the refund. Learn more about the hiring process here.