Showing Percentage In A Query

Below is the code I am using in a query that produces results that look like:

Fault Category------------No Fault Totals
No Faults-----------------------77
Total Work Units---------------521

I would like to also show in the query the percentage of No Faults. In this instance I would need to divide
the 77 no faults by the 521 total work units. Is there a way to do this and show the answer in the query.
I do not want this in a report, just the query.

SELECT FaultCategory, COUNT(*) As [No Fault Totals]
FROM WorkUnitsFaultsMainTBL
WHERE BuildID IN ("E010","C809","F001","C810","F187","A910","M173","M174") AND
FaultCategory IN ('No Faults') AND
[TodaysDate] BETWEEN [Forms]![Queries_ReportsFRM]![StartDateTxt]
AND
[Forms]![Queries_ReportsFRM]![EndDateTxt]
GROUP BY FaultCategory

UNION ALL SELECT 'Total Work Units' As FaultCategory, COUNT([WorkUnit]) As [WU Totals]
FROM (Select Distinct [WorkUnit]
FROM WorkUnitsFaultsMainTBL
WHERE BuildID IN ("E010","C809","F001","C810","F187","A910","M173","M174") AND
[TodaysDate] BETWEEN [Forms]![Queries_ReportsFRM]![StartDateTxt]
AND
[Forms]![Queries_ReportsFRM]![EndDateTxt]) As vTbl;