1. $24/ft $84/ft.
The price increases because it is harder and slower to drill at increased depths.
500
10
28.4 squares x $5000/square = $142,000
T1 = (0.5)(1000)(24+36)
T2 = (0.5)(1000)(36+56)
T3 = (0.5)(1000)(56+84)
Ttotal = 1000[0.5(24) + 36 + 56 + 0.5(84)]
= $146,000
Overestimate
Higher, because trapezoids include small area outside of region under curve.
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