How do you calculate the percentage increase?

1. This is the easiest way to work out a percentage increase Eg. New is 9543 Old is 8546 New(9543) divided by Old(8546) which is 1.116662766 - (round to 2dp) 1.12 x 100 = 112% so take 100% away and your left with 12% which is answer!!! 2. To calculate percentage interest: You need to:

difference of the new and old scores

over

the old score

then multiply by 100

for example:

Result 1: 85

Result 2: 100

Difference = 100-85

= 15

Then: 15/85

= .17647

x 100

= 17.647% increase