A crawler dozer with a universal blade is to be used in a slot$-$dozing operation. The material is a dry, noncohesive silty sand, and is to be moved a distance of $350$ft from the beginning of the cut. The dozing is downhill on a $10\%$grade$.$ The operator will have average skill, the dozer has a power$-$shift transmission, and both visibility and traction are assumed to be satisfactory. The material weighs $108$pcf in the bank state, and will swell $10\%$when excavated by dozing. Job efficiency is assumed to be equivalent to a $50-$min hour. a$.$Assuming a Caterpillar D$8$is used, calculate the direct cost of the proposed earthmoving operation in dollars per bcy$.$The $0$&$0$cost for the dozer is $$64\mathrm{.}80$per hour and the operator's wage is $$10\mathrm{.}85$per hour plus $36\%$for fringes. b$.$Assuming that a CAT $834$wheel$-$type dozer with a straight blade is substituted for the D$8,$calculate the direct cost of the proposed earthmoving operation in dollars per bcy$.($The $834$has $58\%$more flywheel horsepower than the D$8.)$The $0$&$0$cost for the $834$is $$69\mathrm{.}95$per hour, all other conditions of the job are unchanged. c$.$Assume that the $834$dozer$,$ when operating on this particular soil, will have a coefficient of traction of $0\mathrm{.}34.$Estimate the unitproduction cost in dollars per bcy$,$with all other job conditions remaining unchanged. $($a$,$unit production cost $=$$$0,479$Ibcy; b$,$unit production cost $=$$$0\mathrm{.}522$Ibcy; c$,834$unit production cost with traction of $0\mathrm{.}34\%=$$$0\mathrm{.}687$per bcy$)$