A price is increased by 20% and then the new price is decreased by 25%. What is the overall percent change from the original price?

Use multipliers. A 20% increase multiplies the price by $1.20$, and a 25% decrease multiplies by $0.75$. The overall multiplier is $1.20 \times 0.75 = 0.90$, which is a 10% decrease, choice B. Try $100: it rises to $120, then falls by 25% of 120, which is $30, giving $90. Choice A (a 5% increase) comes from computing $20 - 25 = -5$ with a sign slip. Choice C (no change) assumes the percents cancel, but the 25% applies to a larger amount. Choice D (a 45% decrease) adds the percents, $20 + 25$. Successive percent changes multiply; they do not add.