Money earned by performer for 20 persons attending the performance = $300 (option C).
Unitary method refers to a process with the help of which we can find the value of a single unit from the value of multiple units and vice versa.
Given: Money earned by performer for 1 person attending the performance = $15
To find: Money earned by performer for 20 persons attending the performance
By unitary method, We get that:
For 1 person, money earned = $15
For 20 persons, money earned = $15 [tex]\times[/tex] 20 = $300
Hence, money earned by performer for 20 persons attending the performance = $300 (option C).
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