Answer 30%
Explanation:
To find what percentage $8.40 is of $28, we can use the following proportion:
part/whole = percent/100
Let x be the percentage we are trying to find, then we can write:
8.40/28 = x/100
To solve for x, we can cross-multiply:
28x = 8.40 * 100
Dividing both sides by 28, we get:
x = (8.40 * 100) / 28 = 30
Therefore, $8.40 is 30% of $28.