SOLUTION: A painter is paid 12 dollars per hour and can paint 8m^2 with a roller in this time. Renting a spray gun costs 5 dollars for each hour of use, and the painter can paint 20m^2 per

Question 392573: A painter is paid 12 dollars per hour and can paint 8m^2 with a roller in this time. Renting a spray gun costs 5 dollars for each hour of use, and the painter can paint 20m^2 per hour with the spray gun. It takes 1/2 an hour for the painter to clean up after using the roller, but 1 hour using the spray gun. You must pay the painter for her time and you must also pay for renting the spray gun for the total amount of time (including clean up) the spray gun was needed. How much money do you save by using the spray gun on a paint job that involves painting 40m^2
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
A painter is paid 12 dollars per hour and can paint 8m^2 with a roller in this time. Renting a spray gun costs 5 dollars for each hour of use, and the painter can paint 20m^2 per hour with the spray gun. It takes 1/2 an hour for the painter to clean up after using the roller, but 1 hour using the spray gun. You must pay the painter for her time and you must also pay for renting the spray gun for the total amount of time (including clean up) the spray gun was needed. How much money do you save by using the spray gun on a paint job that involves painting 40m^2
ROLLER PAINTING
$12 / hr --------------8 m^2
...
8m^2 /h
40m^2-------------- 5 hours
Total cost of painting 40m^2 = 5*12=
...
SPRAY GUN
20m^2/hr
40m^2 --------------- 2hours
spray gun cleaning -----------1/2 hour
Total time = 2 1/2 hours
painter cost ---------2 1/2*12 =$30
Spray gun hiring charges 5*2 1/2 = $ 12.50
So total cost of painter + cost of hiring spray gun = 30+12.50 =
..
60-42.50 =$ 17.50 saving
...
m.ananth@hotmail.ca

( if the gun is to be cleaned every hour for 1/2 hour then extra 1/2 hour has to be considered)

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