All The Smart Math People Out There!!?

Question

So, I'm stuck on this one math problem, and I don't know what to do. It's not for a grade or anything, but I'm determined to find the correct answer. Ok here's the Q: A puppy weighed 4.5 lbs at 5 weeks and 7.5lbs at 8 weeks. What was the percent of increase? My answer: 3.8% I know it's totally wrong and that's why I need y'alls help. What do I do? Thanks!

Answer 1

The percent of increase is the increase in weight divided by the original weight times 100:

% = [(new - old) / old] * 100

% = [(7.5 - 4.5) / 4.5] * 100

% = (3 / 4.5) * 100

% = 0.666... * 100

% = 66.66...%