Solution:
It is given that :
Area of old crate = 8 square feet
Area of the new crate = 12 square feet
Therefore difference in the area = 12 - 8
= 4 square feet
Now the percentage increase in the area of the crate is given by :
![$=\frac{\text{difference in the area of crate}}{\text{original area of crate}} * 100$](https://img.qammunity.org/2021/formulas/mathematics/high-school/jhbn5d4gcdgae1a225gdgpg6lby31wqyix.png)
![$=(4)/(8) * 100$](https://img.qammunity.org/2021/formulas/mathematics/high-school/i1jlseh37x8t6m0cjo53dhnbdghapjceph.png)
= 50%
So the percentage increase in space is 50%