Question

A cylinder vessel open at the top has a base of diameter 21cc and height 14 cm.Find the cost of tin plating its inner part at the rate of rs.5 per 100cm​

Answer 1

Answer:

67.4155 rs

Step-by-step explanation:

d= 21 cm

h= 14 cm

area of cylinder vessel except its top = 2×pi×r×h + pi×r^2

(2 × 22/7 × 22/2 × 14) + (22/7 × 22/2 ×22/2)

484 × 2 + (242×11)/7

968 + 2662/7

(6776 + 2662)/7

9438/7

1348.29 cm^2

cost per 100 cm = 5rs

cost per 1 cm = 5/100

cost per 1348.29 = 5/100 × 1348.29

= 67.4155 rs