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I realized it worked but don't understand why the value would be null.

--- Update ---

Oh now I see it's because its already initialized in param, so when you reinitialize in the subcode itself...

Wait why?
Also should I do the same thing for Monthly Price.

I get NaN for all the values when I run the code. Not sure why? Here is the code.


import java.util.ArrayList;
class CO2FromElectricity

{
CO2FromElectricity()
{
//default...