We know that Marcus spent 10 hours on his homework this week so: 10 hours = 100%
Marcus is saying that he spent 110% more time doing his homework this week, in comparison to last week.
Then to see if he is correct we have to find 110% of 10 hours.
So if: 100% of 10 hours = 10 hours And: 10% of 10 hours (equivalent to 600 minutes) = 1 hour (or 60 minutes) Then we add the two: 10 hours + 1 hour And we get: 11 hours
As a result, Marcus is correct; he did spend 110% more time on his homework this week.
