please solve this step by step so that I can understand.

Black rocky Inc, is currently renting a machine for $55,000 per year, including all maintenance expenses. It is considering purchasing a machine instead, and is comparing two options: a. Purchase the machine it is currently renting for $120,000. This machine will require $20,000 per year in ongoing maintenance expenses. b. Purchase a new, more advanced machine for $300,000. This machine will require $20,000 per year in ongoing maintenance expenses and will lower costs by $10,000 annually. Also, $35,000 will be spent upfront in training the new operators of the machine. Suppose the company expects to use the machine for another ten years (no matter renting the old machine, purchasing the current machine, or purchasing a new one). The appropriate discount rate is 10% annually, and the machine is purchased today. Maintenance and costs are paid at the end of each year, as is the rental of the machine. Assume also that the machines are subject to a CCA rate of 30%, and there will be a negligible salvage value. The marginal corporate tax rate is 35%. Should the company continue to rent, purchase its current machine, or purchase the advanced machine