Final answer:
To find the percentage, divide the given amount by the total amount and multiply by 100. Therefore, 90% of $10 is equal to $9.
Step-by-step explanation:
To find the percentage, we need to divide the given amount ($9) by the total amount ($10) and then multiply by 100. So, the equation would be:
% = ($9/$10) x 100 = 90%
Hence, 90% of $10 is equal to $9.
Learn more about Finding percentages