pls help, i got the wrong answer for the following questions

Software Systems, Inc. executes the following contract with Xena Company with the following stand alone fair values - computer hardware $250,000, installation services $30,000, three year hardware warranty $25,000, customer support over a one year period $20,000. Xena Company pays Software Systems the full contract price of $300,000 upon delivery of the hardware. What amount of revenue should Software Systems recognize for the delivery of the hardware? 1) $250,000 2) $231,000 3) $300,000 4) $280,000