The given graph compares the average cost of attending college (both four-year and two-yea...

The given graph compares the average cost of attending college (both four-year and two-year combined) between private and public colleges for several selected years.

a. What was the average cost (to the nearest thousand) of attending a private college in the academic year 2000–01? A public college?

---

b. Which of the following are true for the time period 1980–81 to 1990–91: The cost of attending a private college i) increased by 50 percent; ii) more than doubled; iii) increased by more than $10,000; iv) tripled.

---

c. Between which two of the given years did the cost of attending a public college increase the most in terms of the percentage increase?