Answer
$50\%$ increase
Work Step by Step
Change in value:
$=\text{new amount} - \text{original amount}
\\= 18-12 = 6$
There was an increase.
Percent Change:
$ =\dfrac{\text{change in value}}{\text{original amount}}
\\=\dfrac{6}{12}
\\=0.5
\\= 50\%$
