60% of 500 is what percent of 400?

Question: 60% of 500 is what percent of 400?

Solution:
Let
60% of 500 be x percent of 400.

That means,
60% of 500 = x% of 400.
⇒ 60 × 500/100 = 400x/100
⇒ 300 = 4x
⇒ 4x = 300
⇒ x = 75