Norman purchased $420 of stock in Carnival Cruise Lines last week. That stock is now worth $525. Use your knowledge of percent change to determine the percentage by which the value of Norman's stock has increased. Be sure to show your work.

The Norman's stock has been increased to 25%.

Step-by-step explanation:

Norman purchased $420 of stock in Carnival Cruise Lines last week. The worth of the stock at present is $525.

Therefore, the stock worth has been increased from $420 to $525.

The percent change can be determined using the formula:

% increase = (difference between two values / smaller value) * 100

Here, the difference of $420 and $525 was found as $105.

The smaller one of two vlaues is $420.

Percentage increase = (105 / 420) * 100

⇒ 0.25 * 100

⇒ 25 %

The percentage increase of Norman's stock was determined as 25%

Therefore, the Norman's stock has increased to 25%.