Teacher Lead Example:

Mr. Smith invested $5000 in a stock market. After a year, he sold the stocks for $6000. What is the percentage change in his investment?

Solution:

Step 1: Find the difference between the initial investment and the selling price.

$6000 - $5000 = $1000

Step 2: Calculate the percentage change using the formula:

Percentage Change = (Difference / Initial Value) x 100%

Percentage Change = ($1000 / $5000) x 100%

Percentage Change = 20%

Therefore, Mr. Smith’s investment increased by 20%.

Plenary Exam Style Question:

A company’s revenue increased from $500,000 to $750,000 in a year. What is the percentage change in the company’s revenue?

A) 25% B) 33.33% C) 50% D) 66.67%

Solution:

Step 1: Find the difference between the initial revenue and the final revenue.

$750,000 - $500,000 = $250,000

Step 2: Calculate the percentage change using the formula:

Percentage Change = (Difference / Initial Value) x 100%

Percentage Change = ($250,000 / $500,000) x 100%

Percentage Change = 50%

Therefore, the percentage change in the company’s revenue is 50%. The correct answer is C.