Question

A cyclendrical vessel open at the top has a diameter 20 cm and height 14 cm find the cost of tin plating it on the inside at the rate of 7 per hundred square centimetre

Answer 1

Step-by-step explanation:

Diameter of base of cylinder = 20 cm Radius of cylinder = 20/2 = 10cm Height of cylinder = 14 cm Total surface area of cylinder = 2πrh + πr2 = (2 × 22/7 × 10 × 14) + (22/7 × 102) = 880 + 2200/7 = (6160+2200)/7 = 8360/7 cm2 We know that cost per 100cm2 = 50paise So, cost per 1cm2 = Rs 0.005 ∴ Cost of tin painting the area inside the vessel = 8360/7 × 0.005 = Rs 5.97Read more on Sarthaks.com - https://www.sarthaks.com/677455/a-cylindrical-vessel-open-at-the-top-has-diameter-20-cm-and-height-14-cm

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