Yes. Because rational numbers can be written in a form of fraction and they are integers.
Her profit was around the amount of $7-$52
I don't really get your question. But, I will try my best to answer it. 42 is a whole number and you could use the number for any operation.
I hope this helps:)
16 % = 38
(16 × 6 = 96
16 / 4 = 4 so = 38/4 = 9.5)
100% = 38*5 + 9.5
=199.5