Question

A toxin increase from 12ppm to 16ppm. What percent increase is this?​

Answer 1

For percentage increase there is a formula
New value - old value
Divided by old value
Multiplied by 100
16-12=4
(4/12)*100
=33.3%
For percentage decrease
The formula is a bit different
It is old value - new value
Divided by old value
Multiplied by 100