Create an XLSX workbook from these completed-order counts:
April 120, May 150, June 135. Preserve the source values.
Include a total calculated by a formula, a clearly labeled chart,
and a short explanation of the month-to-month changes.
Keep July unknown; do not invent a forecast or target.
Then return a second version with May changed to 160.
The total must update from 405 to 415. Preserve the other inputs.
State whether the chart is linked to cells or is a static image.
