Derby Transportation Inc. designs and builds trains for rail networks across Canada. The company, which is publicly traded, has an October $31$ year end. On March $15,2020,$ Derby Transportation signed a contract with OM Corridor Corp. to design and build $10$ high$-$speed trains, with each train consisting of seven passenger cars. The high$-$speed train will operate between Ottawa and Montreal. The following events took place in $2020$ in relation to the contract:

March $15$: At the signing ceremony, officials from Derby and OM sign a contract, which is for $$10,450,000.$ Derby is to design, manufacture, and deliver the $10$ trains to OM's train yards in Montreal. Derby's management estimates that the design component of the contract would be valued at $$2,079,690$ if contracted for separately, while the manufacturing of the ten trains would be valued at a total $$9,410,310$ if they were purchased separately. Derby agreed to provide a two$-$year assurance$-$type warranty for the trains, and the company's management estimates that the warranty claims would total $$530,000$ based on experience. OM agrees to pay a $$5,290,000$ deposit within $14$ days of signing the contract and to pay the balance within $45$ days of the trains receiving final approval and certification from the Transportation Safety Board.

March $29$ : OM pays the deposit specified in the contract.

May $9$: Derby's engineering staff complete the train design and it is approved by officials from OM as well as the Transportation Safety Board.

August $1$: Derby completes construction of the $10$ trains.

September $1$: The $10$ trains are delivered according to the contract to OM's Montreal train yards.

September $30$: After testing for safety compliance, the trains receive final approval from OM and the Transportation Safety