Quantity Price Total Marginal Total Cost Marginal Average Revenue Revenue Cost Cost 0 $37 $240 10 $31 $310 20 $26 $390 30 $22 $530 35 $20 $690 40 $19 $900 When increasing production from 20 to 30 dress shoes, the marginal revenue is $. nd marginal cost is $_ __. a) 14; 14 b) 15; 15 c) 16; 16 O d) 17; 17