FUNDRAISING= A school is raising money by selling calendars for $20 each. Mrs. Hawkins promised a party to whichever of her English classes sold the most calendars over the course of four weeks. Use the table to answer Exercises 18–20. Write and solve an equation to show the average number of calendars her 3rd period class sold per week during the four-week challenge.

PLEASE ANSWER CORRECTLY, YOU DON'T NEED TO SHOW YOUR WORK!