(Solved) Adding a calculation to a thing

[Victaurus]

Good day

looking for help with adding a calculation answer to a thing.

The first field (100) is a input field. (with a text filed displaying a total 100*0.8=80 as an option to create a thing in the database)
The second field (0.8) Displayed dynamically from Data Type (Admin) with type name (percentage)
The third filed is the total (sum of the above)

ive managed to add most data, but the third field (Total) to display keeps asking me for more options.

Im struggling a bit with creating formulas (displaying percentages). Some help would be really appreciated.

Many thanks

[robert]

If Earnings is a number field, then Input Single walk earnings needs to be a number format as well.

[Victaurus]

@robert Thank you for your reply. Correct, i noticed the format was incorrect.