First; isn't that called a pi chart? Second; here' your answer: 41% of 400 is the same as 41x4=164 22% of 400 is the same as 22x4=88 164-88=76 so the answer is B
Hope this helps :)
Post Script: I wasn't trying to be rude with the first thing if that's how it comes across, I was just wondering cause I live in England and we call them pi charts.
they would not agree that there are 487 paperclips because both of there guesses are greater than that. they would both agree that there are 742 paperclips because 742 is greater than 500 but less than 1000.