A machine that cost £35,000 is operated 8 hours a day in a 5-day week but one hour each day is used for test purposes. For use o
f the machine there are three scales of charges, the first at the rate of £5 an hour for private use, the second at £15 an hour for research work and the third at £40 an hour for commercial work. It is estimated that the number of hours charged at the first, second and third rates are in ratios 4:2:1. What percentage of total receipts do receipts from commercial work represent?
Charges for private use in particular week=4*5*5=100 Charges for research work in particular week=2*15*5=150 Charges for commercial work in a particular week=1*40*5=200 Total charges in a particular week=100+150+200=450 Percentage of charges of commercial work in total receipts=(200/450)*100=44.4%