Why is total NaN?

Question

I can't figure out why total shows up as NaN (not a number) in this code
https://code.sololearn.com/WL69y4wzB7Zf/?ref=app

Answer 1

You have to assign total variable to 0 in first line of your code.
like this =》
var total = 0;

Answer 2

Oh so the variable is identified as numerical. That makes sense. Thanks!