Explain how to solve

Sed Ehreen buys $3$ put option contracts, where the contract size is $100$ GE stocks, with a strike price of $$105$ at a quoted price of $$3\mathrm{.}00.$ At option expiration, these stock sell for $$66.$ What is the net profit on the transaction?

$$10,800$ Gain

$$10,800$ Loss

$$108$ Gain

$$900$ Loss