Help: LUA Script for sensor multiplyed by value

[Lillios]

Hey.

I would like some help making a dummy sensor.
I have a Co2 senor connected to my raspberry that is running Domoticz.

The value from the Co2 sensor is not showing up correct, and needs to be multiplyed by x50.

How do i type a LUA to write the value from that sensor and x50 to my Dummy?
The value in this screenshot should be 7,9x50=395ppm

I a complete novice on makeing scipts

[ycahome]

try something like this:

WattMetricKW = tonumber(WattMetric)/1000