Answer
given,
firm is producing = 2,475 units
output by hiring 50 workers W = $20 per hour
25 units of capital R = $10 per hour
marginal product of labor = 40
marginal product of capital = 25
[tex]\dfrac{MP_l}{MP_c}=\dfrac{40}{25}[/tex]
[tex]\dfrac{MP_l}{MP_c}=\dfrac{8}{5}[/tex]
[tex]\dfrac{W}{R}=\dfrac{20}{10}[/tex]
[tex]\dfrac{W}{R}=2[/tex]
[tex]\dfrac{MP_l}{MP_c} < \dfrac{W}{R}[/tex]
Firm is not minimizing the cost because the firm use more capital and less labor.