1) Since the original price was $250 we can write:
$ %
250------- 100
300 ------ x
2)
And then, we can cross multiply those ratios:
![\begin{gathered} (250)/(300)=(100)/(x) \\ 250x=30000 \\ x=(30000)/(250) \\ x=120 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/uj106l76a4k2bmyzi6ds7oqej6tyxo6vrr.png)
So 300 corresponds to 120%, But since the question is what percentage was the price increased, Hence:
120-100= 20%
3) So the price was increased by 20