Not sure where I'm going wrong . Can you please help?

Required information

Three different companies each purchased trucks on January 1, 2018, for $66,000. Each truck was expected to last four years or 200,000 miles. Salvage value was estimated to be $7,000. All three trucks were driven 74,000 miles in 2018, 35,000 miles in 2019, 30,000 miles in 2020, and 68,000 miles in 2021. Each of the three companies earned $55,000 of cash revenue during each of the four years. Company A uses straight-line depreciation, company B uses double-declining-balance depreciation, and company C uses units-of-production depreciation.

Answer each of the following questions. Ignore the effects of income taxes.

1. b-1. Calculate the net income for 2021? (Round "Per Unit Cost" to 3 decimal places.)

Answer is complete but not entirely correct.

	Net Income
Company A	$40,250selected answer correct
Company B	$35,000selected answer incorrect
Company C	$34,940