Access query to find percentages

Hi,
My first post so apologies for length. I have recently been thrown in the deep end with an Access database and I'm having a problem with a query. I have one table that records results for chemical mixes. I am interested in the date and the value of the RightFirstTime field which will be "pass" or "fail". I basically want to create a query that shows me the percentage of passes over a period of time broken down by month. I have one query that will show me total records for each month and one that shows total passes but I can't get the two together to work out the percentage. I have attched my queries. I also created a month table just to look up month name.Start Free Trial

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SELECT m.month, Count(L.RightFirstTime) AS Total
FROM  tbl_Lacquer_Mix AS L, tbl_month as m
WHERE ((L.DateTime) Between [start] And [end]) AND ((M.MonthId)=Month([L].[DateTime]))
group by m.month;
 
 
SELECT m.month, Count(L.RightFirstTime) AS Pass
FROM  tbl_Lacquer_Mix AS L, tbl_month as m
WHERE ((L.DateTime) Between [start] And [end]) AND ((M.MonthId)=Month([L].[DateTime])) and (l.RightFirstTime = "PASS")
group by m.month;