Answer:
store D
Explanation:
Store A: $25 for 45 minutes
Cost for 45 minutes = 25
Cost for 1 minute =

Cost for 60 minutes (= 1 hour ) =

=

Store B: $30 for 1 hour
Cost for 1 hour = $30
Store C: $45 for 1.5 hours
Cost for 1.5 hours = $45
Cost for 1 hour =

Store D: $80 for three 1 hour lessons
Cost for 3 1-hour lessons = $80
Cost of 1 1-hour lesson =

So, The best deal is store D