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

A tank with rectangular base and rectangular sides open at the top is to be constructed so that its depth is 3 m and volume is 75 m3. If building of tank costs Rs. 100 per square metre for the base and Rs. 50 per square metres for the sides, find the cost of least expensive tank.

A tank with rectangular base and rectangular sides open at the top is to be constructed so that its depth is 3 m and volume is 75 "m"^3 . If building of tank costs Rs. 100 per square metre for the base and Rs. 50 per square metre for the sides, find the cost of least expensive tank.

A rectangular grassy lawn measuring 30m by 28 m is to be surrounded externally by a path which is 2 m wide. Find the cost of levelling the path at the rate of Rs 5 per square metre.

A rectangular grassy lawn measuring 30m by 28 m is to be surrounded externally by a path which is 2 m wide. Find the cost of levelling the path at the rate of Rs 5 per square metre.

The volume of a closed square based rectangular box is 1000 cubic metre. The cost of constructing the base is 15 paise per square metre and the cost of constructing the top is 25 paise per square metre. The cost of constructing its sides is 20 paise per square metre and the cost of constructing the box is Rs. 3.Find the dimensions of box for minimum cost of construction.

One side of a square plot is 250m, find the cost of levelling it at the rate of Rs. 2 per square metre.

Find the cost of fencing a square park of side 300m at the rate of Rs. 20 per metre.

The length and breadth of a rectangular field are in the ratio 3:2. If the area of the field is 3456\ m^2 , find the cost of fencing the field at Rs. 3.50 per metre.

A rectangular room is 9 m long and 6 m wide. Find the cost of covering the floor with carpet 2 m wide at 35 per metre.

A rectangular garden is 120 m long and 65 m broad .A path of uniform width of 5 m has to be constructed around it on its outside .Find the cost of gravelling the path at Rs. 11.40 per m^(2) .