It seems you deleted my answer. You wrote that it should deleted because:
- The numbers are unreferenced; 3.8 million is at the high end of the estimates I have seen.
- The arithmetic is flat out wrong. (Over an hour, over $1000 per teacher)
- You don't think it answers the question.
I have added a reference for 3.8 million teachers. Frankly it was easy to find, and is referenced in many places. Maybe I should have given the reference in the first place, but it was quoted by virtually every news article about the claim.
I did make a mistake in the cost, and the correct one is below. I would have written the same answer if I had got the math correct there. But both the figures you gave are wrong.
The time is:
4,239,530 / 3,800,000 / 4 = 0.27 hours per teacher per year.
That's about sixteen minutes. That's the figure I gave and it is correct.
The cost is:
$3.9b / 3,800,000 / 4 = $256 per teacher per year.
That was, as I say, my mistake and I've fixed it in the answer. If you are going to correct people's arithmetic at least get it right yourself.
As for your opinions as to whether the answer is relevant, that's your opinion. Plenty of upvotes and plenty of comments disagree with you.
You have a history of deleting my answers. You are entitled to dislike them, but please downvote instead of deleting.