If the ratio of the change in the book's price to its new price is 1 : 5, What is the % price increase?  Choose the correct option
A) 25%
B) 50%
C) 75%
D) 90%
E) 100%
Solution:-   Given   ratio of change in book price/ new price = 1 /5   =&gt;(new price−old price)/new price=1/5   =&gt; old price/new price=4/5 ---- equation 1   % increase is always with respect in the initial or old price.   =&gt; % increase = (( new price - old price)/old price)*100---equation 2   substituting 1 in 2 we have   % increase = ((new−(4/5)new)/((4/5)new))∗100   = 25%   25%NSWER:25%
<result>A</result>
If the ratio of the change in the book's price to its new price is 1 : 5, What is the % price increase?