Answer :
A function assigns the values. The decrease in selling price from 700 units sold to 900 units sold is 10. Thus, the correct option is B.
What is a Function?
A function assigns the value of each element of one set to the other specific element of another set.
Price of the unit when 900 units were sold,
P=1200-20s
900 = 1200 - 20s
s = 15
Price of the unit when 700 units were sold,
P=1200-20s
700 = 1200 - 20s
s = 25
Now, the difference in the selling price of the units is,
Difference = 25 - 15 = 10
Hence, the decrease in selling price from 700 units sold to 900 units sold is 10. Thus, the correct option is B.
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