A contractor wants to investigate the production and cost differentes of using a $45$ tade on a cralue potooc $19$e$45).$ The material is dry clay and is to be moved a distance of $150$ tt from thebregning ch the ca$.$ The trung i chinaa $10\%$ grade. The operator will have excellent skil. The site conditions will be dark for Vetiny The maca wirg.$\%,$pot in the bank state. Job efficiency is assumed to be eqivalent to a $45-$min hour Mhatis the copears suancitofactor?