Answer
$\frac{1}{4}$
Work Step by Step
As per the information
Original price $ 10
New price $ 12.50
Price increase = New price – Old price = $ 12.50 - $ 10 = $ 2.50
Now ratio of the increase in price to the original price
$ 2.50 to $ 10
($ 250)/($ 10) = (250)/10= (250 × 100)/(10 × 100)= 250/1000= (250 ÷ 250)/(1000 ÷ 250)= $\frac{1}{4}$
