In math "of" means multiply (x). So 250% increase of 28,000 means
250% x 28,000 + 28,000 (we add 28000 because it's an increase so we have to add it to the original amount).
250% x 28000 =
2.5 x 28000 = 70,000
Now add it back to the original 28,000
70,000 + 28,000 = 98,000
