A 2-column table with 5 rows. Column 1 has entries Approximate Value, Exact Value, Absolute error, Ratio, Percent error. Column 2 has entries a, b, c, d, e. A survey indicates that there are approximately 120 dairy farms in a given area. If there are exactly 400 farms, and exactly 20% of them are dairy farms, what is the percent error? Fill in the table below.