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15. To produce, you combine labour (L) and machines, with labour variable in the short run. The following table shows how output and the market price for your product vary as you vary the number of workers (L). What happens to marginal cost (MC) and average total cost (ATC) when you hire worker 11? 10.0j L 9 J 10 11 Output (Qs) 95 100 104 Market Price given Output $11 $10 $9 a) MC may increase or decrease. ATC increases. C b) MC may increase or decrease. ATC may increase or decrease. c) MC increases. ATC increases. d) MC increases. ATC decreases. e ) MC increases. ATC may increase or decrease