Change 48% to 0.48
0.48 x 18 = 8.64
rounded would be 9
Perimeter is equal to 90 in.
Area is approximately equal to 389.71 in.
The answer she has is not correct.
All the steps she did are correct, except they forgot to convert the decimal answer into the proper percentage by multiplying it by 100.
The correct answer should be 0.125 * 100 = 12.5%