Antonio’s Car Services provides maintenance services for motorized vehicles. In March 2021, Rick placed an order for a new set of tires for $350. When a customer purchases goods or services in excess of $300, Antonio’s gives the customer a 25% discount coupon for future purchases made in the next three months. Antonio’s estimates that approximately 80% of customers utilize the coupon and that on average those customers will purchase goods or services that typically sell for $75. Required: (a) How many performance obligations are in Rick’s contract? (b) Prepare a journal entry to record revenue for this transaction, assuming that Antonio’s uses the residual method to estimate the stand-alone selling price of new tires sold without the discount coupon.