You will be using a Motor Grader to clean off a section of highway that it $36-$feet wide plus two $8-$foot shoulders for a total width of $52-$feet. You will assume that there is sufficient space outside the shoulders for material to be stockpiled as part of your cleaning efforts. You are to assume an overlap of $2-$feet and an operating speed of $6mph.$ The length of roadway to be cleared is $14,600$ long. You have available to you the following equipment:

a$.$ MG $135H($ $$\frac{165}{h}r$ with a $12-$foot moldboard that operates at a blade angle of $30$ degrees$)-$ $$15,000$ delivery$/$mobilization$/$takeaway $-$ job efficiency of $85\%$

b$.$ MG $140H($ $$\frac{225}{h}r$ with a $12-$foot moldboard that operates at a zero degree blade angle$)-$ $$20,000$ delivery$/$mobilization$/$takeaway$-$ job efficiency of $80\%$

c$.$ MG $16M($ $$\frac{300}{h}r$ with a $16-$foot moldboard that operates at $30$ degrees$)$ $$25,000$ delivery$/$mobilization$/$takeaway $-$ job efficiency of $90\%$

d$.$ MG $24M($ $$\frac{400}{h}r$ with a $24-$foot moldboard that operates at $45$ degrees$)-$ $$30,000$ delivery$/$mobilization$/$takeaway $-$ job efficiency of $88\%$