A contractor agrees to sink a well 40 metres deep at a cost of 30 for the
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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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a The total cost constitutes an arithmetical series whose terms are ...View the full answer
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