Answer:
100%
Explanation:
The initial price of the paper = 1.99
The final price of the pack of paper = 3.98
We need to find the percentage increase in the price of the product. It can be solved as follows :
![\%=(3.98-1.99)/(1.99)* 100\\\\=100\%](https://img.qammunity.org/2022/formulas/mathematics/college/7yhwulqnmfeo0lz6375oagaziqoupn77r8.png)
So, the percentage increase in the price of the product is 100%.