Pages per minute test javascript - continuation of topic

Question

in this case: https://www.sololearn.com/Discuss/2668040/pages-per-minute-test-javascript

2 questions:

1-st
why we don't need to put (i + "<br />") in "console.log"?

I understand that br / is responsible for that every number from output is written on a new line...

2nd question:
why we have to write: ppm+=20 in the code?
why simple ppm+20 won't work?

Answer 1

Console is not document where you put html elements.( And console is block level start from new line)

Ppm += 20 will make ppm a new variable that will be 20+ to old ppm value that will be used next time in loop.
If you will you ppm+20 ppm will always be its initial value and you will get same result in all loops.