### Computing Total and Marginal Revenue

4. Below is a demand curve. From it, compute total revenue and marginal revenue. Put your answers in the yellow cells, entering just a number--the dollar sign is already there. When you are finished, click the "Check Answers" button and see how you did. If you are totally lost, or totally lazy, click the "I cannot do it!" button and I will fill in the answers for you. (Hint: Do the Total Revenue column first, then the Marginal Revenue column. Notice that the first Marginal Revenue box is between 0 and 1 units of output and the last is between 4 and 5 units of output.)

 Output Price Total Revenue Marginal Revenue 0 ---- \$0 \$ 1 \$9 \$ \$ 2 \$7 \$ \$ 3 \$5 \$ \$ 4 \$4 \$ \$ 5 \$3 \$

### Computing Total and Average Revenue

5. Below is a table showing sales and marginal revenue. Compute total revenue and average revenue. Put your answers in the yellow cells, entering just a number--the dollar sign is already there. When you are finished, click the "Check Answers" button and see how you did. If you are totally lost, or totally lazy, click the "I cannot do it!" button and I will fill in the answers for you. (Hint: Do the Total Revenue column first, then the Average Revenue column.)

 Which Sale Marginal Revenue Number of Sales Total Revenue Average Revenue First \$12 1 \$ \$ Second \$11 2 \$ \$ Third \$10 3 \$ \$ Fourth \$9 4 \$ \$ (Remember, marginal revenue is additional revenue from selling one more.)

6. After six semesters of college, Greta Grouch had a grade-point average of 3.25. After her seventh semester her grade-point average dropped to 3.20. What can you tell about her grades for the seventh semester?