The teachers' edition of a statistics textbook sells for $150, and students' edition of the book sell for $50 each. Which function can be used to find the average cost per book if two teachers' editions and x students' editions are purchased?
a) f (x) = 150+50x over 1+x
b) f (x) = 150+50x over 2+x
c) f (x) = 300+50x over 1+x
d) f (x) = 300+50x over 2+x
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