7.2 is the answer i hope this helps!
First, set up the percent proportion, cross multiply and divide. Finally, subtract the answer you get from the original number.
You should get, $1,425.50.
Exact form : 45/4
Decimal form : 11.25
mixed number form : 11 1/4
6 x 2/2 = 6, because 2/2 is 1 and 6x1 is 6