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 `A.P.` ?

In which of the following situations, does the list of numbers involved make an arithmetic progression, and why? (i) The taxi fare after each km when the fare is Rs 15 for the first km and Rs 8 for each additional km. (ii) The amount of air present in a cylinder when a vacuum pump removes 1/4 of the air remaining in the cylinder at a time. (iii) The cost of digging a well after every metre of digging, when it costs Rs.150 for the first metre and rises by Rs. 50 for each subsequent metre. (iv) The amount of money in the account every year, when 10000 is deposited at compound interest at 8 % per annum.

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

The cost of fencing a square field at 60 paise per metre is Rs. 1200. Find the cost of reaping the field at the rate of 50 paise per 100 sq. metres.

The cost of 2 1/3 metres of cloth is Rs 75 1/4dot Find its cost per metre.

The cost of 30 metres of polyster cloth is Rs. 450. Find the cost of 16 metres of cloth.

Find the cost of sinking a tubewell 280m deep, having diameter 3m at the rate of Rs. 3.60 per cubic metre. Find also the cost of cementing its inner curved surface at Rs. 2.50 per square metre.

Find the cost of sinking a tubewell 280m deep, having diameter 3m at the rate of Rs. 3.60 per cubic metre. Find also the cost of cementing its inner curved surface at Rs. 2.50 per square metre.

The cost of papering the four walls of a room at 75 paise per square metre is Rs 240. The height of the room is 5 metres. Find the length and the breadth of the room, if they are in the ratio 5: 3 .

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

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