A company has $250MM of EBITDA. It grows to $400MM in five years. Each year, you paid

Fantastic news! We've Found the answer you've been seeking!

Question:

A company has $250MM of EBITDA. It grows to $400MM in five years. Each year, you paid down $50MM of debt. Let's say you bought the company for 8.0X and sold it for 9.0X.
How much equity value did you create?
How much is attributed to each strategy in creating equity value?