This solution uses a 24-hour clock My interpretation of "between" in this case is an exlusive index; "between 10 and 12" only covers the hours 10 and 11; 12 signifies a new hour

First create a Shift. This represents the proper work hours for a babysitter. Then create a FamilyRate. FamilyRates keep track of pay by the hour Finally, use the Shift to calculate the pay rate.

I created the FamilyRate and Shift classes separately. My intention is that in the future, one might have different hours and want to maintain separate shifts without having to re-enter the rates set per families.

This solution uses NUnit testing framework. You can run the exe and it will print output of the kata's calculations. You can run it without debug mode as there is a Console.ReadLine() at the end to pause the application. You will see the following output:

BabySitting Calculator Output Family A pays $15 per hour before 11pm, and $20 per hour the rest of the night Full Shift: $190 17 thru 22: $90 23 thru 3: $100 1 hour shift @ 17: $15 1 hour shift @ 23: $20

Family B pays $12 per hour before 10pm, $8 between 10 and 12, and $16 the rest of the night Full Shift: $124 17 thru 21: $60 22 thru 23: $0 0 thru 3: $64 1 hour shift @ 17: $12 1 hour shift @ 22: $0 1 hour shift @ 0: $16

Family C pays $21 per hour before 9pm, then $15 the rest of the night Full Shift: $189 17 thru 21: $99 22 thru 23: $30 0 thru 3: $60 1 hour shift @ 17: $21 1 hour shift @ 22: $15 1 hour shift @ 0: $15