Final answer:
The percentage increase from $3.20 to $3.45 is approximately 7.81%.
Step-by-step explanation:
The percentage increase from $3.20 to $3.45 can be calculated as follows:
Step 1: Find the difference between the two amounts: $3.45 - $3.20 = $0.25
Step 2: Divide the difference by the original amount ($3.20) and multiply by 100 to get the percentage:
$0.25 / $3.20 * 100% = 7.81%
Therefore, the percentage increase from $3.20 to $3.45 is approximately
7.81%
.