The inner diameter of a well is `2.5` meter and it is 8 meters deep. What would be the cost of cementing its inside. at 350 rupees per square meter?

The inner diameter of a well 2.5 metres and it is 8 metres deep. What would be the cost of cementing its inside from the top to a depth 2 1/2 metres at the rate of 350 rupees per square metre?

The tent for an exhibition is as shown below, with a half - cylinder on top of a rectangular prism. What is the cost of making it, at the rate of 2000 rupees per square meter?

If we take the length and width as 3 meters and 5 metres, what would be the perimeter?

A garden is in the shape shown below, with two semicircles on the shorter sides of a rectangle of sides 30 m and 20 m. What is the cost of planting grass in it, if the rate is Rs 25 for each square meter.

In a household there are 4 CFL's of 15W each working for 5hrs a day, 2 fans of 60W working for 5hrs daily , 500Wiron box working for 15 minutes a day. How many units of electricity is used in this house . What is the cost of electricity costing 3 rupees per unit ?

A rectạngular water tank has inner dimensions 5 metres, 4 meters and 2 meters. How many litres of water it contain?

A tank with rectangular base and rectangular sides, open at the top is to be constructed so that its depth is 2 m and volume is 8m^3 . If the building of tank costs Rs. 70//sq metres for the base and Rs. 45//_"square" metres. For sides, what is the cost of least expensive tank?

A conical firework is of base-diameter 10 centimetres and height 12 centimetres. 10000 such fireworks are to be wrapped in colour paper. The price of the colour paper is 2 rupees per square metre. What is the totäl cost?

In the newly constructed auditorium in the school, there are 8 cylindrical shaped pillars of same size. Each pillar has a height of 4 cm . Dlameter of the pillar is 1 meter. i. Find the curved surface area of a pillar. ii. Find the curved surface area of 8 pillars. iii. If it cost 160 rupees to paint one square metre, how much will it cost?