Power Query Ignoring Decimals using Custom Column Formula

[mohammadyousaf]

Hi Everyone, 
Can someone explain this... I tried Editor as well to chagne the type to decimal but still having the issue where the calculations ignoring the decimals. 
I am using this Custom Column Fromula and the expected result is 18.5 while I am getting 18. 

if [Normal_Hours] = null or [Normal_Hours] = 0 or [OT_Hours] = null then
    0
else if [Normal_Hours] + [OT_Hours] <= 10 then
    [Normal_Hours] + [OT_Hours] +1
else
    [Normal_Hours] + [OT_Hours]

Thank you in advance for your help. 

[mohammadyousaf · Accepted solution]

It is sloved as my steps were not in order, I went back to Source and change data type to Decimal Type in advance Editor. 

Tricky.