Julian, an experienced motorcycle mechanic, recently decided to share his expertise by
writing and selling an ebook. After conducting some market research, Julian knows that if he
charges x dollars per download, he will sell -4x + 160 downloads of his ebook in his first
year.
The online bookstore will charge Julian 25% of the amount he charges per download. So,
Julian will learn 75% of the amount he charges per download, or 0.75x dollars, in profit.
What two prices can Julian charge per download to earn exactly $900 in profit in his first
year?