A store gets a bucket of eggs for $16.20 and sells a dozen eggs for $3.50. If there are 450 eggs in the bucket, by what percent has the store increased the price per dozen eggs?

Price of a bucket of eggs $16.20

price for a dozen of eggs $3.50

number of dozens in 450 eggs:

450/12

=37.5

price of 37.5 will be:

37.5*3.50=$131.25

The percentage the store has increased the price will be:

(131.25-16.20) / 16.20*100

=710%