First, you would create an equation for this problem.
[tex] \frac{18}{15} [/tex]= [tex] \frac{x}{100} [/tex]
Next, you would cross multiply.
15x = 1,800
Now, you would isolate the x. To do this, you would divide both sides by 15.
x = 120
It is a 120% increase.
I hope this helps!
