On March 12, Medical Waste Services provides services on account to Grace Hospital for $11,000, terms 2/10, n/30. Grace pays for those services on March 20. Required: For Medical Waste Services, record the service on account on March 12 and the collection of cash on March 20. (If no entry is Fequired: required for a particular transaction/event, select "No Journal Entry Required" in the first account field.)