Answer:
30%
Step-by-step explanation:
$ 5.98
20/100 × 22.42/1 = $ 4.48
$ 22.42 - $ 4.48 = $ 17.94
If they split that bill in two each would pay $ 5.98
I hope this helps.
There are many possible solutions. Here are some:
(-2,12) (2,2) (6,1) (10,0) (-6,4)
hope it helps
20
because 4 can go into 20 5 times without a remainder
, so our solutions are 
and 
.