Answer:
 Bonus of Brianna = 125 $
Step-by-step explanation:
 Amount of Brianna's yearly bonus = 155$
 Amount taken away for each customer care complaint = 2.50$
 Number of complaints received against Brianna in the year = 12
 Total amount lost by Brianna due to complaint = 12*2.50 = 30$
 Amount of bonus received by Brianna after reduction of complaint loss = 155-30 = 125$
 Bonus of Brianna = 125 $