Question

29th question please answer me as possible.

Answer 1

Original Volume of the cup

= Volume of cylinder - volume of hemispherical bottom

=> πr²h - 2/3 × πr³

Here, r = 3.5 (since diameter = 7)

Now,

πr²h = 22/7 × 3.5 × 3.5 × 14

=> πr²h = 539 cm³

1000 cm³ = 1 litres
=> 1 cm³ = 1/1000

=> 539 cm³ = 539/1000 litres

Now volume of hemisphere

= 2/3 × π × r³

=> 2/3 × 22/7 × 3.5 × 3.5 × 3.5

=> 89.834 (approx) cm³

=> 89.834 cm³ = 89.834/1000 litres




So the volume of mug

= 539/1000 - 89.834/1000

= 449.166/1000

= 0.449166 litres

=> Cost = 0.449166 × 80

=> Cost = ₹35.93328

=> Approximate cost = ₹35.93


Hope it helps dear friend ☺️