A student models the number of hours it takes to finish X percent of a video game by the function
y = 80x/120-x,
where X is between 0 and 100 percent.
Based on this model, how much of the game can be completed in 75 hours?
a. Between 50 and 60 percent
b. Between 60 and 70 percent
c. Between 70 and 80 percent
d. Between 80 and 90 percent
e. Between 90 and 100 percent