Lakers Inc. manufactures and sells commercial appliances. It also provides installation and maintenance services. In 2021, Lakers Inc. sold appliances to Celtics Inc. at $1,000, and Celtics Inc. chose Lakers Inc. to do the installation. The fair values of the installation and appliances are estimated to be $200 and $900, respectively. Upon delivery of the product on June 1, Celtics Inc. paid $800. The remainder was paid in full on July 1 when Lakers Inc. completed installation. What is the amount of sales revenue that should be recorded on June 1? Lakers Inc. follows IFRS. a. $1,000 b. $818 C. $800 d. $900 e. $618