Is the given answer a reasonable solution to the problem

Me. i can't figure out this question. give an explanation too. .

Sanderson is having trouble with his assignment. his shown work is as follows: − 3 7 7 3 = − 3 7 × 7 3 = − 21 21 = −1 however, his answer does not match the answer that his teacher gives him. complete the description of sanderson's mistake. find the correct answer.

How do you write 0.5% as a fraction