Complete the function, which calculates how much you need to tip based on the total amount of the bill and the service.

You need to consider the following ratings:

Terrible: tip 0%
Poor: tip 5%
Good: tip 10%
Great: tip 15%
Excellent: tip 20%

The rating is case insensitive (so "great" = "GREAT"). If an unrecognized rating is received, then you need to return:
"Rating not recognized" in JavaScript, Python and Ruby...
...or null in Java
...or -1 in C#

Because you're a nice person, you always round up the tip, regardless of the service.

Examples
calculatetip(30, "poor") => 2
calculatetip(20, "hi")=> "Rating Not Recognized"
calculatetip(107.65, "great") => 17

Tests
calculatetip(78, "good") =>
calculatetip(50, "poor") =>
calculatetip(125, "excellent") =>

Good luck!

This challenge comes from Katbow on CodeWars. Thank you to CodeWars, who has licensed redistribution of this challenge under the 2-Clause BSD License!

Want to propose a challenge idea for a future post? Email yo+challenge@dev.to with your suggestions!