Correct Answer: Option C

Explanation

The Value of the total output in the economy will be gotten by adding all the values of the output and subtracting its intermediate consumption (the goods and services used to produce the output) to derive its value-added. That means, output - input

Value of output = 10 + 12 + 15 + 20 - (10 + 12 + 15)

57 - 37 = 20

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