Notice that the decrease in books numbers is always 5 times the increase in price so
R= book numbers * price
In this case books numbers is (300-25) which is (300-5x) ,and price is (40+5) which is (40+x)
R = (300-5x)(40+x)
= 12000-200x+300x-5(x^2)
=12000+100X -5(X^2)
To check if you consider there is no increase in price x=0 which means R will be 12000$ as in question and if u consider it is 5 it will give u R=12375$ which is the new R( 275*45)
"Three hundred books sell for $40 each, resulting in a revenue of $12,000. For each $5 increase in price, 25 fewer books are sold. Write revenue R as a function of the number x of $5 increases." How would you get this problem started?
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