How to Convert numeric data type with 1 digit decimal

Question

How to add to a numeric data type with 1 digit decimal a zero.

For Instance

Assuming that I got a result from a calculation 7.7 which means 7.07, how to add the leading zero or how to convert to a 2 decimal points

 

The ROUND() rounds it to 7.70 and or 8.0 and what I am looking for to be 2 decimal points with the leading zero, in other word the result should be 7.07

 

I will really appriciates for sample code that converts from 7.7 to 7.07

 

Thanks 

Jose