Yes.
7919
Two.
It doesn't have two factors.
No, it is an even number and therefore can be at least divided by 2.
3, 5, and 7.
11/12 cannot be simplified - because 11 is a primenumber.
It's already in its simplest form - 67 is a primenumber.
18/29 cannot be simplified - because 29 is a primenumber !
I could bore you with a long mathematical explanation (ask if you want one), but to simplify things, 2 is a prime number.
It's already in its simplest form - since 43 is a primenumber.
ANSWER: $73.0816% off of $87= 16% discount applied to $87= $87 - (16% * $87)= $87 - (0.16 * $87)= $87 - 13.92= $73.08