Rip garage, inc. (459 ellis avenue, harrisburg, pa 17111), is an accrual basis taxpayer that repairs automobiles. in late december 2017, the company repaired samuel mosley's car and charged him $1,000. samuel did not think the problem had been fixed, so he refused to pay; thus, trip refused to release the automobile. in early january 2018, trip made a few adjustments under the hood; trip then convinced samuel that the automobile was working properly. at that time, samuel agreed to pay only $900 because he did not have the use of the car for a week. trip said "fine," accepted the $900, and released the automobile to samuel. an irs agent thinks trip, as an accrual basis taxpayer, should report $1,000 of income in 2017, when the work was done, and then deduct a $100 business loss in 2018. prepare a memo to susan apple, the treasurer of trip, with your recommended treatment for the disputed income.