Suppose a certain item used to sell for 30 cents per pound, and you see that it's been marked up to 45 cents per pound. What is the percent increase?

50%

Step-by-step explanation:

45 cents is 15 cents more than 30 cents. The increase in cents is 15.

15 is half of 30. Half is also 0.5, 1/2, or 50%. The increase is 50%.

You can also answer this using the percent change formula.

percent change = (new number - old number) / (old number) * 100%

percent change = (45 - 30) / 30 * 100%

percent change = 15/30 * 100%

percent change = 0.5 * 100%

percent change = 50%

If the result is positive, it is a percent increase.

If the result is negative, it is a percent decrease.