Mr Browns owns and operate a dog grooming. Figure 21.1 shows the cost and revenue curves for a pet grooming session. Initially, Mr Browns sets his price to maximise profits. Figure 21.1: Costs, Revenue per grooming session Calculate the change in total supernormal profit if Mr Browns changes his objective from profit maximisation to revenue maximisation. a) -R225 b) -R117 c) R108 d) R125