A solid metallic cylinder has its base of
diameter 42 cm and it is 2 m high. Find the
cost of painting its curved surface if it costs 25
paise per square centimeter.
Answers
Answer:
Rs.6597.5
Step-by-step explanation:
curved surface area of cylinder=2πrh
where r=21cm and h=200cm
so 2xπx21x200=26390cm^2
now for 1 cm^2 cost is 25 paise
so for 26390cm^2 it's
26390x25=659750 paise
so divide by 100 to get it in Rs.
659750/100=Rs.6597.5
hope it helps:)
Radius = Diameter÷2 = 42÷2=21 cm
Height = 2m = 200cm
Total surface area of cylinder = 2πrh + 2π(r)²
( On taking 2π as common)
= 2π(rh+r²)
= 2π (21×200 + 21²)
= 2π ( 4641 )
= 2 × 22/7 × 4641
= 29172 cm ²
Cost of polishing 1 cm² = 25 paise = 25 / 100 = 1/4 rupees
∴ Cost of polishing 29172 cm² = 1/4 × 29172
= 7293 rupees
Hope my answer helps you....please mark my answer as brainliest answer