I need help understanding why those two answers are wrong. Thanks.

On February 1, 2016, Arrow Construction Company entered into a three-year construction contract to build a bridge for a price of $8, 510,000. During 2016, costs of S2,170,000 were incurred with estimated costs of $4,170,000 yet to be incurred. Billings of S2,670,000 were sent and cash collected was $2,420,000. In 2017, costs incurred were $2,670,000 with remaining costs estimated to be $3,855,000. 2017 billings were $2,920,000 and $2,645,000 cash was collected. The project was completed in 2018 after additional costs of S3,970,000 were incurred. The company's fiscal year-end is December 31. Arrow recognizes revenue over time according to percentage of completion. Compute the amount of revenue and gross profit or loss to be recognized in 2016, 2017, and 2018 using the percentage-of-completion method