Help plz plz I only have 30 minutes

Answer:
50% increase in weight
Step-by-step explanation:
First, write the situation out in an equation:
7/100=10.5/x
If we find the difference assuming 7 is 100% and 10.5 is x%, then we can subtract to find the difference.
Solve this equation for x. The answer would look like this:
7/100=10.5/150
Then, since 150% - 100% is 50%, the answer is a 50% increase.
Hope this helps! Please mark brainliest! :)