The following is a slightly altered version of the replies given at this thread:
20. Assume the total revenue from the sale of x items is given by
R(x) = 39ln (8x+1), while the total cost to produce x items is C(x) = x/5. Findthe approximate number of items that should be manufactured so that profit, R(x) - C(x) , is maximum.
The following is a slightly altered version of the replies given at this thread: