Question

Anna organizes a marathon as part of a fundraising event for the Seabin Project to clean up oceans. Anna uses a phone tree to inform the poeple about the event. She calls four people. Each of the four people calls up four more people to inform about the event and so on. How many people inform by end of the $5^{th}$ round of calls?

• A. 60
• B. 62
• C. 64
• D. 68

Answer 1

The correct option is C 64

Anna calls four people.
And each of the four people calls up four more people.
So, the number of people informed at the end of the $5^{th}$ round of the calls are
$=4\times 4\times 4$
$=4^3$
$=64$