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## To find the sales for 4 million items produced and sold, let's assume that the expression for the sales is given by S(x), where x represents the number of items produced and sold in millions.

Let's say Sales (in millions) is given by the expression S(x).

To find the sales when 4 million items are produced and sold, you substitute x = 4 into the expression for S(x):

Sales (S) when x = 4 = S(4)

Substitute x = 4 in the expression for S(x) and calculate the value of S(4).