The students in Naomi's class sold calendars for a fund-raiser this year and last year. This year, the selling price of each calendar was $13.25. The price this year represents 6% more than the selling price of last year. PART A:
What was the selling price, in dollars, of each calendar last year?
PART B:
The students in Naomi's class earned 20% of the money received from selling these calendars. (They sold 650 last year and 600 this year)

Based on the information, which statement is true?
A. The students earn more money last year by $20
B. The students earn more money last year by $35
C. The students earn more money this year by $20
D. The students earn more money this year by $35