Please explain the detailed calculation steps, I don't need only the answer!

Your company needs to acquire a new heavy-duty truck, as shown in the picture below, to haul equipment and supplies to the new LNG terminal being built at Kitimat, BC. The tractor and trailer costs $240,000. Your options are to borrow at an interest rate of 8% (pre-tax) or lease the unit. Neither option will affect revenue. If you lease, the lease payments are $40,000 per year, payable at the beginning of each year, for eight years. If you buy the truck and trailer, you will use a CCA rate of 30%, using the Accelerated Investment Incentive. Initially, assume that both firms have a tax rate of 40%.

If the lessor has a 40% tax rate, what is the minimum annual lease payment the lessor will accept?

a. $36,793

b. $37,884

c. $38,670

d. $39,669

e. $40,000