The green is right, the red is wrong. Can't figure it out.

Down Under Products, Ltd., of Australia has budgeted sales of its popular boomerang for the next four months as follows: The company is now in the process of preparing a production budget for the second quarter. Past experience has shown that end-of-month inventory levels must equal 10% of the following month's sales. The inventory at the end of March was 6, 800 units. Required: Prepare a production budget for the second quarter, in your budget, show the number of units to be produced each month and for the quarter in total