Explanation:

Given that to find 15 of 80

=> What % of 80 is 15

Let it be 'p'

=> p% of 80 = 15

=> p x 80/100 = 15

⇒p = 15 x 100/80

⇒p = 1500/80 = 18.75%

Therefore, 15 is 18.75% of 80

=> 18.75% of 80 = 15

Hence, option 2 is the correct answer.