Question 855265
There is obviously something wrong with the charge of $15 an hour.

We are told the childcare will be needed for 50 hours a week. There is no reason to assess less than 40 hours.
50 hours
y = 15*50=750
y= 150 + 10 (10)=250

less than 40
y=15*30=450 


y=150

The plans are equal for ten hours. After ten hours Plan B is better
Plan A is better for less than ten hours but is not an option for the father.