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The floor of an office has dimensions 5 mx 3 m. The cost of painting the walls and ceiling is 7,440 at the rate of 60/m². Find the height of the room (in m). (rounded off to one decimal place)

A6.8

B4.5

C3.5

D5.6

Answer:

A. 6.8

Read Explanation:

total area= wall area + ceiling area

=2(lh+bh)+lb

total cost = 7440

rate per area = 60

so the total area =7440/60=124= 7440/60=124 m2m^2

ceiling area =lb=5×3=15= lb=5\times3=15

the final area =12415=109=124-15=109

wall area =2(lh+bh)=109= 2(lh+bh)=109

=2(5h+3h)=109=2(5h+3h)=109

16h=10916h=109

h=6.81h=6.81


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