If a device's data usage increases by 25% from 40 GB, what is the new usage?

If a device's data usage increases by 25% from 40 GB, what is the new usage?

• A. 60 GB
• B. 50 GB
• C. 70 GB
• D. 45 GB

Answer: (B)

Understanding percent increases: you take the original amount and add the increase expressed as a percentage of that original amount. Here, start with 40 GB and increase by 25%. Calculate 25% of 40 GB: 0.25 × 40 = 10 GB. Add that to the original 40 GB to get 50 GB. So the new usage is 50 GB. The other numbers correspond to different increases (60 GB would be a 20 GB increase, 70 GB a 30 GB increase, 45 GB a 5 GB increase), not the 25% increase given.

Understanding percent increases: you take the original amount and add the increase expressed as a percentage of that original amount. Here, start with 40 GB and increase by 25%. Calculate 25% of 40 GB: 0.25 × 40 = 10 GB. Add that to the original 40 GB to get 50 GB. So the new usage is 50 GB. The other numbers correspond to different increases (60 GB would be a 20 GB increase, 70 GB a 30 GB increase, 45 GB a 5 GB increase), not the 25% increase given.