Answer:
$54.51
Step-by-step explanation:
an easier way to do this is simply by multiplying 47.40x115%, which is 54.51.
another way to do this is by multiplying 47.40x15%, which is 7.11, then you'll have to added to 47.4, which gives you the same answer of 54.51
by factoring the answer is - x=1/2, 5
hope it helps:))
If your asking for what that would be called cause I don't understand what your asking but it would be called the midpoint