Using it's concept, it is found that the percentage of 4c that 2a represents is given by:
[tex]P = \frac{a}{2c} \times 100\%[/tex].
The percentage of an amount a over a total amount b is given by a multiplied by 100% and divided by b, that is:
[tex]P = \frac{a}{b} \times 100\%[/tex]
In this problem, we have that the amounts are a = 2a, b = 4c, hence the percentage is given by:
[tex]P = \frac{2a}{4c} \times 100\% = \frac{a}{2c} \times 100\%[/tex]
More can be learned about percentages at https://brainly.com/question/10491646
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