BRAINIEST ANSWER

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 of 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?

A.44.5
B.24.5
C.34.5
D.55.5

Question

03-02-2016
Mathematics

contestada

BRAINIEST ANSWER

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 of 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?

A.44.5
B.24.5
C.34.5
D.55.5

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taskmasters taskmasters · Answer 1 · 2016-02-09T15:32:33+01:00

hour of private use: 4 hours
hour for research work: 2 hours
hour for commercial work: 1 hour
hour for test purposes: 1 hour.

A total of 8 hours a day where only 7 hours generate income.

private use: 4 hours * 5 per hour = 20
research work: 2 hours * 15 per hour = 30
commercial work: 1 hour * 40 per hour = 40

20 + 30 + 40 = 90 for 7 hours in one day.

Percentage of commercial work on total receipts for the day.

40 ÷ 90 = 0.4444 x 100% = 44.44% CHOICE A. 44.50