Maharaja Samosa produces samosas.

The market for samosas is perfectly competitively, and the price is $4.00 a samosa.

The labor market is competitive, and the wage rate is $120 a day.

The table shows part of the workers' total product schedule.

Calculate the marginal product of hiring the fourth worker and the value of the marginal product of the fourth worker.

Workers Samosas per day

2 18

3 54

4 84

5 108

6 120

The marginal product of hiring the fourth worker is _____ samosas a day.

The value of the marginal product of the fourth worker is $________ a day.