Answer: Cost of each ream of paper= $8
Explanation:
According to the given question:
Total reams of paper Azul bought=10
Total spending of Azul to buy 10 reams of paper=$84
Tax on purchase paid by him= $4
Thus cost of 10 reams of paper=$84-$4=$80
Now, Cost of each ream of paper=

Therefore, Cost of each ream of paper=$8.