The amount is 2.4, the base is unknown and the percent is 60%.
What is the base?
The base is the part of the problem that represents the "whole".
The given number 2.4 is 60% of another number which is unknown. Therefore, this unknown number is the base since it represents the whole.
Thus, we have found that the amount is 2.4, the base is unknown and the percent is 60%. The correct answer is option D.
Learn more about percentages and bases here-https://brainly.com/question/843074
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