Question 1132084
Another useless "math" problem.
Nothing is learned from it, except it's not .80 cents.
It's .80 dollars, or 80 cents.
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In response to the comments, I doubt the student learned anything by having the problem done by others.
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I never "bad mouth" other tutors.  If they submit a wrong answer, I might solve the problem with the correct answer.
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But, there's a lower limit to what's considered a worthwhile problem.  I've seen "What is 2+2?" posted more than once and no one took it seriously.  I think "making change" is only slightly more interesting.
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But my most serious complaint is doing the problems for the students.  I've gotten TY notes saying, "I just want the answer."  No interest in learning anything.  I think doing it for them is doing a disservice.
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The general public has no interest in knots, it's true.  The general public is not interested in  mi/hr, km/hr, or in algebra, trigonometry or calculus, either, so why mention them?
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I won't deign to cavil the point further.