Twelve months ago, Donnie bought shares of stock in a Biotechnology Company for $25 per share. If the shares are now selling for $30 per share, what is the percent of increase in the value of the stock?

25%

Step-by-step explanation:

Buying price: $25 per share

Selling price: $30 per share

=> the percent of increase in the value of the stock is calculated as the following formula:

({Selling price - Buying price) / Buying price} * 100%

= { ($30 - $25) / $25} * 100%

= 1/5*100%

= 25%