Company's revenue for selling x (thousand) items is provided by r(x) = (33x-x^2)/(x^2+33) in millions of dollars. Determine value of x (rounded to nearest item) which maximizes revenue and determine max revenue (rounded to nearest dollar).
Choices:
i) 4831 items
ii) 6831 items
iii) 16,500 item
iv) 8250 items