help completing each of the following contribution format income statements by supplying the missing numbers. a. b. c. d. Sales revenue $ $530,100 $ $6 Variable expenses 278,164 110,636 Contribution margin 128,352 162,488 4 Fixed expenses 85,452 187,032 Operating income 18,903 Income taxes 23,111 18,877 Net income $13,232 $ $56,631 $