A dome of a building is in the form of a hemishphere. From inside, it was white- washed at the cost of Rs 498.96. If the cost of white - washing is Rs 2.00 per square metre, find the
inside surface area of the dome.

A dome of a building is in the form of a hemisphere. From inside, it was white-washed at the cost of Rs 498.96. If the cost of white-washing is Rs 2.00 per sq. m. Find the : (i) inside surface area of the dome (ii) volume of the air inside the dome.

A done of a building is in the form of a hemishphere. From inside, it was white- washed at the cost of Rs 498.96. If the cost of white - washing is Rs 2.00 per square metre, find the volume of the air inside the dome.

The family pays Rs 1000 for electricity on an average in those months in which it does not use a water heater. In the months in whih it uses a water heater, the average electricity bill is Rs 1240. The cost of using the water heater is Rs 8.00 per hour. Find the average number of hours the water heater is used in a day.

A door of length 2m and breadth 1m is fitted in a wall. The length of a wall is 4.5m and the breadth is 3.6m [fig 11.6]. Find the cost of white washing the wall, if the rate of white washing the wall is rs20 per m^2 .

The circumference of a field is 440m. Find (a) its radius (b) its area (c ) cost of levelling the ground at the rate of Rs.20 per m^2

A solid wooden toy is in the form of a hemisphere surmounted by a cone of same radius. The radius of hemisphere is 3.5 cm and the total wood used in making of toy is 166(5)/(6)cm^(3) . Find the height of the toy. Also find the cost of painting the hemispherical part of the toy at the rate of Rs. 10 per cm^(2) (take pi=(22)/(7) )

It costs Rs 2200 to paint the inner curved surface of a cylindrical vessel 10 m deep. If the cost of painting is at the rate of Rs 20 per m^(2), find: (i) inner curved surface area of the vessel, (ii) radius of the base, (iii) capacity of the vessel.

A container opened from the top is in the form of a frustrum of a cone of height 16cm with radii of its lower and upper ends 8cm and 20cm respectively. find the cost of the milkwhich can completely fill the container at the rate of Rs. 20 per litre.[Take pie= 3.14 ]

A bus stop is barricaded from the remaining part of the road, by using 50 hollow cones made of recyled cardboard. Each cone has a base diameter of 40 cm and height 1 m. If the outer side of each of the cones is to be painted and the cost of painting is Rs 12 per m^(2) , what will be the cost of painting all these cones ? ("Use"pi=3.14)" and take "sqrt(1.04)=1.02)

The slant height and base diameter of a conical tomb are 25 m and 14 m respectively. Find the cost of white washing its curved surface at the cost of Rs 210 per 100m^(2).