3. Suppose that an underground oil deposit can be accessed by a number of different wells drilled from the surface. Wells cost $30 per day to run; oil is worth $1 per gallon. (a) What is the efficient number of wells? (b) How many wells will be drilled if there are no restrictions on drilling? # of Oil Wells Output of Oil (gallons/day) Total Average Marginal 0 0 40 2 80 3 115 4 145 5 170 6 195 7 205 8 210