Find the point of intersection of the following lines:
The line of slope 2 passing through the midpoint of the segment joining the points 
and 
.
The line perpendicular to 
and passing through 
.
Definitions:
Marginal Returns
The additional output gained by adding one more unit of a specific input, assuming all other inputs remain constant.
Total Returns
The complete return on an investment over a given time period, including both capital gains and dividends or interest.
Average Returns
The average amount of profit or loss generated by an investment over a specific period.
Technical Efficiency
Condition under which firms combine inputs to produce a given output as inexpensively as possible.
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