Read through section 3D in your book carefully and take notes. Then answer the questions below. Directions: You can either type directly into the document or print it out and handwrite your answers. You will then need to upload your solutions to the drop box in Canvas. SECTION 3D Explain what an index number is. What is the ultimate purpose of an index number? Using Table 3D.1 on page 189 and example 2 on pg.190 answer the following questions: Suppose it cost $30 to fill your gas tank in 1985. How much was the same amount of gas in 1975? How much was the same amount of gas in 2015? Imagine that you are using the year 2000 as a reference year. If the index number of year A is 35, is the price in year A more or less than the price in 2000? Explain your answer. Explain what CPI is and why it is useful. (pg. 191). Take a look at the formula used to adjust prices for inflation on page 193 in your textbook. Write down the formula here: In the year 1992 the CPI was 140.3. In the year 2020, the CPI was 258.8 Using the