Answer:
Percentage change in price is 71.4%
Step-by-step explanation:
Here, we want to get the percentage change in price
Mathematically, that will be;
(new price - old price)/old price * 100%
new price = $1.20
old price = $0.70
% change will be ;
(1.20-0.70)/0.70 * 100%
= 0.5/0.7 * 100% = 71.4%