What's the meaning of magic numbers?

[flei2019]

Hi, thanks for your great work to calculate Tokens/s. I read your code of App.js and found some magic numbers. Can you please add comments for them? Just list out some numbers as below. It is awesome you would add comments for all magic numbers.

1.     let finalPromptTime =
        theoryTimePrompt_in_ms * getFloatRatio_F16(quantType) * 1.8 +  // What's the meaning of ”1.8“?
        convertByteToMB(2 * memoryTransfer) * (0.008 / 100);           // What's the meaning of "0.008 / 100" ?
   

2. What's the meaning of extraFactor 2.0,1.5,1.0 ...?