Unknown Renowned Enry

Algebra Level 3

Calvin bought himself three new cool math books from renowned authors Henry, Renry and Fenry.

However, he lost his receipts, so he doesn't know how much each one cost. He remembers, though, that Henry's book was 75% to 80% the price of Renry's, and 30% to 40% the price of Fenry's.

We can deduce that Renry's book was \(a\)% to \(b\)% the price of Fenry's. What is \( a \cdot b \)?

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