In March a store sells 20 bags of charcoal a week for $12 each. In April a promotion is offered causing 30 bags to be sold at $10 each.

1. What happened to Supply? Did we have an increase/decrease in supply or quantity supplied?

2. How are you sure?

3. What happened to Demand? Did we have an increase/decrease in demand or quantity demanded?

4. How are you sure?

In May and June sales return to 20 bags for $10 each. In July the month starts with a blistering heat wave and 30 bags are sold for $12 each.

5. What happened to Supply in July? Did we have an increase/decrease in supply or quantity supplied?

6. How are you sure?

7. What happened to Demand in July? Did we have an increase/decrease in demand or quantity demanded?

8. How are you sure?

In August the charcoal company is inspected and many violations are found. After this 15 bags are sold for $15 each.

9. What happened to Supply? Did we have an increase/decrease in supply or quantity supplied?

10.How are you sure?

11.What happened to Demand? Did we have an increase/decrease in demand or quantity demanded?

12.How are you sure?