Question: A contractor agrees to sink a well 40 metres deep at a cost of 30 for the first metre, 35 for the second metre and

A contractor agrees to sink a well 40 metres deep at a cost of £30 for the first metre, £35 for the second metre and increasing by £5 for each subsequent metre.

(a) What is the total cost of sinking the well?

(b) What is the cost of drilling the last metre?

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