Denise made a total of 80 outbound calls on her shift at work today. Of those 80 calls, 55% ended with prospective customers rejecting the call, 15% ended with Denise leaving a voicemail message, and 10% resulted in a successful sale. What is the total number of calls on which Denise was rejected by customers today?

I'm a bit confused by your percentages.

55+15+10=80%

What happened to the other 20%?

Using the information you provided, we know that 55% of the 80 calls rejected Denise.

55% of 80 is your answer.

80 X 0.55= 44

Thus 44 calls were rejected by the customers. This number makes sense because 40 is 50% of 80, thus we can can expect that 55% of 80 is more than 40.

The previous answer does not make sense because 12 is signivicantly less than 40.

12 is 15%, the number of calls that ended with her leaving a voicemail and, thus, haven not been rejected by the customer.