When entering a decimal value that ends in one or more zeroes, the trailing zeroes will be removed if the value is entered in an input field that expects a string value.
To prevent this, add an " " to your value.
Example: If you enter the number 30.70 in a string input field, the last 0 will be trimmed automatically and the output will be 30.7. In some cases, this last zero is needed for example, for a project or product code. Hence you need to add " " to your value so that the last 0 will not be trimmed.
When entering 0 as a value for an input field, encapsulate it in double-quotes "0", else it will be considered as null. Also you can use "To text" formula to convert the number to string.