A. Increasing at an increasing rateB. Increasing at a decreasing rate C. DecreasingD. Constant

Table 13-9 Number of Fixed Output Variable Workers Cost Cost 10 $30 100 $30 $15 180 $30 $30 240 $30 $45 280 $30 $60 300 $30 1575 Refer to Table 13-9. The marginal products of hiring additional workers are