Final answer:
The percent increase in the price of chocolate malt balls is found by subtracting the old price from the new price, dividing the result by the old price, and then converting to a percentage, giving us 24.62%.
Step-by-step explanation:
To find the percent increase in the price of chocolate malt balls, we first calculate the difference between the new price and the old price:
$0.81 (new price) - $0.65 (old price) = $0.16.
Next, we divide this increase by the original price to find the increase in percentage:
$0.16 / $0.65 = 0.2462, or 24.62% when expressed as a percentage.
Therefore, the correct answer is a) 24.62%.