Answer:
6%
Explanation:
A percent is the ratio of part/whole multiplied by 100.
In this problem, the part is the donation (534) and the whole is the total sales (8900).
Thus, we can multiply the ratio 534/8900 by 100 to find what percentage, P, of the total sales was donated by the clothing store:

Because the denominator in a percentage is always 100, you could take 6% of 8900 and see whether the answer is 534:
(6/100) * 8900 = 534
(3/50) * 8900 = 534
545=534