5. The Doughnut Deli charges $3.50 per dozen for the first three diesen purchased by a customer, but then charges only $2.80 per done for any additional doughnuts purchased. The Thrifty
Bake Shop charges $3.10 per dozen regardless of the number of dozens purchased. When is a more
economical to buy from the Doughnut Deli?

idk

step-by-step explanation:

take the logarithm of both sides (the base of the log doesn't matter):

apply the exponent property - this says that :

distribute the log terms on both sides:

group like terms together:

divide through both sides by the coefficient on :

you can do some additional rewriting here using the properties of the logarithm to simplify things if you like: