The cost of sinking a tubewell is 25 paise for the first metre and an additional 4 paise for every subsequent metres. Find the cost of last metre and the total cost of sinking the tubewell 500 metres deep.

The cost of digging a well for the first metre is Rs 150 and rises by Rs 20 for each succeeding metre.Will the sequence form an AP.?

The cost of painting a solid sphere at the rate of 50 paise per square metre is Rs. 1232. Find the volume of steel required to make the sphere.

The rate of planting the grass is x per square metre. Find the cost of planting the grass on a triangular lawn whose base is y metres and height is z metres.

The cost of 20 metres of ribbon is Rs 335. Find the cost of each metre of it.

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.

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.

If a cloth costs Rs 715 1/4 per metre, find the cost of 3 2/5 metres of this cloth.

The cost of 7 2/3 metres of rope is rs 12 3/4dot Find the cost of cloth per metre.

Cost of 20 metres of cloth is Rs. 1500. Find the cost of 12 metres of cloth.