Question

13. A roller 150 cm long has a diameter of 70 cm. To level a playground it takes 800 complete revolutions.
Determine the cost of levelling the playground at the rate of 90 per sq. m​

Answer 1

Answer:

Area of playground = 750 × CSA of roller

= 750 × 2 × 22÷7 × 35 × 150

= 750 × 33000

= 24750000 cm^2

= 2475 m^2

Cost of leveling = 2475 × 0.75

= Rs 1856.25