x% of y is y% of:

Correct option is A

Given:

x% of y is y% of ?

Solution:

​$$\frac{x}{100} \times y = \frac{y}{100} \times ?$$​​

Cancelling out y from both sides (assuming y≠0):

​$$\frac{x}{100} = \frac{1}{100} \times ?$$​​

? = x