The firm will employ 3 workers
Marginal cost is the change in total cost as a result of hiring one more unit of labour. The marginal cost of labour is equal to the wage rate.
Marginal revenue is the change in total revenue when output is increased by one unit
A rational producer would continue to higher labour as long as marginal revenue is higher or equal to marginal cost. If marginal revenue is less than marginal cost it means that productivity has fallen.
Looking at the marginal revenue and marginal cost on the table, marginal revenue is greater than marginal cost when 1,2 and 3 units of workers are used. But the number of workers that yields the highest product is 3 workers. So, 3 workers should be employed.
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