Final answer:
Total sales revenue for 2020 cannot be determined without information on the price and quantity of output. The question does not provide data on the highest sales revenue month.
Step-by-step explanation:
Total revenue is the income the firm generates from selling its products.
It is calculated by multiplying the price of the product by the quantity of output sold.
In this case, the question does not provide information on the price and quantity of output, so we cannot determine the total sales revenue for 2020.
As for the highest sales revenue month, we would need data on the sales revenue for each month in 2020 to determine which one recorded the highest value.