What is the least common denominator of this problem?

The only denominator in
  S = a/(4 -r)
is (4 -r). It is also the "least common denominator."


When solving problems with fractions, it isn't always necessary to find the "least common denominator." Often, you can work the problem easily enough just using the product of the denominators. In some cases, this may cause an extra step to reduce any fractions, but it can simplify the effort and reduce the angst.

The answer is d. 606 because you have to multiply 30% ( percent) times 2020 (total) to get ur answer.