Please help, I've tried this type of question three times but still getting it wrong. I used the formula c/(1+I) k. Please show me step by step because I'll like to understand. Thank you!

Consider the following two tractors a company can purchase. The following tables provide the costs the company will incur (in thousands of dollars) in the lifetime of each tractor. Diesel Gasoline Initial Cost $18,000 $6,000 Operating Costs per Year $10.000 $12,000 Expected Life Find the present value of the costs of using the two tractors. 7 5 The transportation firm can only afford one of the tractors. The two tractors have identical production capabilities. The firm's cost of capital is 10%