Question

38 a recycling bin contained 40 pounds of plastic in october and 50 pounds of plastic in november. by what percentage did the amount of plastic increase from october to november? ① 10% ② 25% ③ 20% ④ 80%

Explanation:

Step1: Find the increase in amount

The amount in October is 40 pounds, and in November is 50 pounds. The increase is \( 50 - 40 = 10 \) pounds.

Step2: Calculate the percentage increase

The formula for percentage increase is \( \frac{\text{Increase}}{\text{Original Amount}} \times 100\% \). Substituting the values, we get \( \frac{10}{40} \times 100\% = 0.25 \times 100\% = 25\% \)? Wait, no, wait. Wait, \( 10/40 = 0.25 \)? No, \( 10\div40 = 0.25 \)? Wait, no, \( 10\div40 = 0.25 \) is 25%? But wait, the options have 25% as option B? Wait, no, wait, let me recalculate. Wait, the original amount is 40, increase is 10. So \( (10/40)\times100 = 25\% \)? But wait, the options: option B is 25%, option C is 20%. Wait, did I make a mistake? Wait, 50 - 40 is 10. 10 divided by 40 is 0.25, which is 25%. But wait, maybe I misread the numbers. Wait, the problem says October is 40, November is 50. So increase is 10. 10/40 = 0.25 = 25%. So the correct answer is B. 25%? Wait, but let me check again. Wait, 40 to 50: the increase is 10. 10/40 = 0.25 = 25%. So option B is 25%.

Wait, but maybe I made a mistake. Wait, 40 times 1.25 is 50? 40*1.25 = 50, yes. So 25% increase. So the correct option is B. 25%.

Answer:

B. 25%