The total revenue obtained (in thousands) from selling x hundred items in a particular day is given

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Question:

The total revenue obtained (in thousands) from selling x hundred items in a
particular day is given by R, which is a function of variable x. Given that dR/dx = 20- 4x.
a) Determine the total revenue function R
b) Find the number of items sold in one day that will maximize the total revenue and
evaluate this total revenue