How many decibels would the 3-mW AP need its power increased to match the 60-mW AP?

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A network engineer notices that two mesh APs are having problems communicating. After reviewing the current radio configurations, it is noted that one AP is transmitting at 3 mW while the other is transmitting at 60 mW.

How many decibels would the 3-mW AP need its power increased to match the 60-mW AP?
A . 8
B . 12
C . 13
D . 20
E . 57

Answer: C