SQL Query using calculation in SELECT not working - sql

Question

the purpose of this query is to take the percentage of late orders to total number of orders. So the calculation part of this query is only pulling back zeros. Everything else works. I commented the part below that is pulling back zeros. What am I doing wrong?
SELECT
case LM.DState
WHEN 'OH' THEN 'OH Order'
WHEN 'NC' THEN 'NC Order'
WHEN 'TX' THEN 'TX Order'
WHEN 'WA' THEN 'WA order'
Else 'Other'
End as 'OrderType',
count(LM.OrderID) as 'Vol',
sum(case
WHEN datediff(day, S.Appt, S.Arrived) > 0 THEN 1
else 0
END) as 'TotalLates',
--PART THAT IS ONLY PULLING ZEROS, SHOULD BE NON-ZERO
CAST (
sum(case WHEN datediff(day, S.Appt, S.Arrived) > 0 THEN 1 else 0 END)
/ count(LM.OrderID)
as decimal(5,2)
) *100 as 'OTD%'
FROM ((Customers.dbo.CusOrders as LM WITH (NOLOCK) inner join
Customers.dbo.CusLocations as S WITH (NOLOCK) on LM.OrderID = S.OrderID) inner join
Customers.dbo.Loads as L with (NOLOCK) on LM.OrderID = L.OrderID)
WHERE LM.CusCode = 'Domestic'
GROUP BY case LM.DState
WHEN 'OH' THEN 'OH Order'
WHEN 'NC' THEN 'NC Order'
WHEN 'TX' THEN 'TX Order'
WHEN 'WA' THEN 'WA Order
Else 'Other'
End

Answer 1

It's due to rounding that occurs with integer division, since you're calculating a percentage the value is always below 1, and that gets rounded to 0, you can fix this by multiplying the numerator by 1.0:
CAST (
sum(case WHEN datediff(day, S.Appt, S.Arrived) > 0 THEN 1 else 0 END)*1.0
/ count(LM.OrderID)
as decimal(5,2)
) *100 as 'OTD%'
For example:
SELECT 5/7
--0
SELECT 5.0/7
--0.714285