Question

A photograph has been enlarged to three times its previous size. By what percent has the size increased

Answer 1

300%

If its 100% it is the same size
200% is twice the size
300% is then three times the size

Answer 2

all depends on the numbers involved in the question (if there is any) but if there isnt than Ghastly is right

Answer 3

No increase, 0% Increase, 100% of original size.
Double, 100% Increase, 200% of original size.