Always want one decimal place sql

Hi All ,
I want always one decimal place number 
cast(convert(DECIMAL(10,2), 10.100)as numeric(36,1)) This syntax giving correct output  if value is in decimal it is rounding to 10.1
but if It is numeric then  
cast(convert(DECIMAL(10,2), 10)as numeric(36,1)) It is showing 10 only but  I want  10.0

How I can do that 
Regards,
Vishal Bedre