Final answer:
The court should admit the summary chart as evidence because the city supervisor can provide the necessary foundation for it.
Step-by-step explanation:
The court should admit the summary chart prepared by the city supervisor as evidence. In general, expert testimony is required to lay a foundation for a summary or chart. However, there are exceptions to this rule. In this case, the summary chart was prepared by a city supervisor who has firsthand knowledge of the employee's work attendance record. Therefore, the supervisor can provide the necessary foundation for the chart's admission.