7,400 increased To 18,600 about what percentage did it increase​

Anyone know? is appreciated! will mark brainliest if correct!

How many of the 250 grandparents in the population would you expect to prefer online shopping with merchant a? merchant a: 4 merchant b: 6 merchant c: 2 merchant d: 3 other: 5 none: 5 answer choices: a. about 4 b. about 8 c. about 40 d. about 21

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie