*Change/Original
Original: 18 New: 26
subtract: 26 - 18= 8
So 8 is your change and 18 is your original
Do a Proportion:
8/18 = x/100
multiply: 100 x 8= 800
divide: 800 / 18= 44.4444444444.......
round it: 44.4 so round the tenth ( if the number is less than 5 you just leave it or if the number is greater than 5 you round up) the 4 in the tenths place is less than 5 so you just leave it and your answer will be 44 or 44.4
The percent increase from 18 to 26 is 44.4% or 44%