Answer:
Water temperature in an ocean varies inversely to the water’s depth. Between the depths of 250 feet and 500 feet, the formula
T
=
14
,
000
d
gives us the temperature in degrees Fahrenheit at a depth in feet below Earth’s surface. Consider the Atlantic Ocean, which covers 22% of Earth’s surface. At a certain location, at the depth of 500 feet, the temperature may be 28°F.
Solution :
= k.n (cost proportional to quantity)
35000 = k . 700
k = 
= 50
So = 50 n
Now 
(cost proportional to square of n)
3430 = 490000 P
Now, 
(fixed)
Therefore,
Total, 
I think it might be the last one. Hope it helps:)
-35
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