Jonathan bought a book at Ᵽ420 with 5% tax. Find the cost of the book without tax?

If 36 out of 50 pupils got a passing grade in mathematics 6, what percent of the pupils passed?

Lucy got 48 points from their math quiz. If she got 80%, how many items are there in the test?

Mother bought a pair of sandals which costs ₱850 at 20% discount. Find the amount of discount.

Joanne gets 15% on every sale of apples and grapes. Her sales usually amount to ₱3,400. How much is her profit?