The chart shows the marginal cost of producing apple pies. A 3-column table titled the cost of pie production has 7 rows. The first column is labeled Pies produced per day with entries 0, 1, 2, 3, 4, 5, 6. The second column is labeled Total cost with entries 0, 1, 1.50, 1.75, 2.25, 3.50, 5. The third column is labeled Marginal cost with entries 0, 1, 0.50, 0.25, 0.50, 1.25, and 1.50.
According to the chart, the marginal cost of producing the second pie is .