A roller is 150 cm long has a diameter of 70 cm. To level a play ground it takes 750 complete revolutions. Determine the cost of leveling the play ground at the rate of 75 cents per m sq
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Answer:
185625 cents
Step-by-step explanation:
Diameter of the roller=150cm=70/100=0.7m
Therefore it's radius=0.7/2=0.35m
Height of the roller=150cm=150/100=1.5m
CSA of the roller=CSA of the cylinder
=2πrh
=2×22/7 ×0.35 × 1.5
=44×0.05×1.5
=3.3 sq.m
No. of revolutions=750
Area of playground=3.3 × 750
=2475 sq.m
Rate=75 cents / sq.m
Cost of levelling whole playground=2475×75=185625 cents
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