please explain witb steps

Interest and MARR Interest is expected to be 10% per year unless stated otherwise To start his quarry, he needs to purchase rock digging systems. There are 3 options on the market. Unit C Starter 33 15 $K Rock and Roller Bigger and Boulder Cost of 25 equipment Material and labor 14 9 savings per year 8 6 Life 6 8 Scrap 1.5 2.5 14 6 7 3.3 $K $K yrs $K 3. Which of the rock moving systems is the best? a. Rock and Roller b. Bigger and Boulder c. C Starter d. 4 laborers at $9/hr each, working 45 hrs a week, 40 weeks a year