What will be the total cost (in Rs) of polishing the curved surface of a wooden cylinder at rate of Rs 50 per m2, if its diameter is 70 cm and height is 6m?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 660
The diameter of the wooden cylinder = 70 cm
Radius = 70/2 =- 35 cm = 0.35 m
Height = 6m
CSA of wooden cylinder = 2πrh = 2 × (22/7) × 0.35 × 6 = 13.2 m2
Total cost = 50 × 13.2 = Rs 660