the cost of drilling a tubewell is rupees 2.50 per food for the first Hundred feet and an additional rupees 0.25 for every subsequent food find the cost of the last put and the total cost of 220 feet deep tubewell
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Step-by-step explanation:
Given:
For 1st 100 feet:
1st term (a) = 2.50
Common difference (d) = 2.50
n = 100
Now:
an = a + (n-1) d
an = 2.50 + (100-1) 2.5
an = 2.50 + 247.50
an = 250
Now:
Sum of 100 feet:
Sn = (2.50 + 250)
Sn = 50 (252.5)
Sn = 375
For the other 120 feet:
Take 1st term (a) = 2.75
Common difference (d) = 0.25
n = 120
Now:
an = a + (n-1) d
an = 2.75 + (120-1) 0.25
an = 2.75 + 29.75
an = 32.5
Now:
Sum of 120 feet:
Sn = (2.75 + 32.5)
Sn = 60 (35.25)
Sn = 2115
Now:
Total cost of 220 feet deep well:
Final answer: 2490
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your answer is in the attachments
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