To raise money, students sell candy grams. ENTIRE QUESTION:

To raise money, students sell candy grams. From past experience, they expect to sell 400 candy grams at a price of $4. They have also learned from experience that each $0.50 increase in price causes a drop in sales of 20 candy grams

a. Write an equation that models the situation

.b. Suppose the student council needs a revenue of at least $1800. Write and solve the inequality to find all the possible prices that will achieve this goal.

c. Show how your solution would change if the student council needed to raise $1600 or more.