A plant bought a brand-new machine for its production line. A major maintenance costs $5,000 each year. The expenses will occur at EOY four and will continue every three years thereafter up to and including year 13. The interest rate is 12% per year. What is the present worth at time 0. Select one: a. $8,195 b. $3,460 c. $11,512 d. $2,420 Question 8 Not yet answered Marked out of 2.50 p Flag question The fixed cost for a steam line per meter of pipe is $500X+$50 per year. The cost for loos of heat from the pipe per meter is $5.2/X^0.5 per year. Xis a continues dosing variable and represents the thickness of insulation in meter. The optimal thickness of the insulation is? Select one: a. 0.0205 meters b. 0.0301 meters C. 0.0600 meters d. 0.0305 meters