To find the percent increase you will create a ratio of the difference between the 2 prices and the starting price.
<u>(12.60-10.50)
</u> 10.50
<u>
2.10
</u>10.50
<u>
210
</u>1050
<u>
1
</u>5 is the ratio.<u>
</u>
It’s b , i hope it’s not wrong :)
4.08, or 4 2/25 :) hope this helps