Answer: It becomes 120% of original dough.
Step-by-step explanation:
Since we have given that
Jay is letting her bread dough rise,
After 3 hours, her bread dough is [tex]1\frac{1}{5}=\frac{6}{5}[/tex] of its original size.
We need to find the percent of its original size is Jay's bread dough.
So, Percentage will be
[tex]\frac{6}{5}\times 100\\\\=6\times 20\\\\=120\%[/tex]
So, it becomes 120% of original dough.