What is the % change in price? What is the % change in quantity demanded for the whey protein?

2. In questions 2. i) - iv) we are concerned with examining the effects on quantity demanded for whey protein after its price has changed from $30 to $20. We are given a demand curve and table below: Product Demand Price Product Demand Product Point Whey Protein Price A $30 B 2 $20 Note: For computations round to the nearest hundredth (ex. .12 for .126) and use a minus sign if your answer is negative (EX. -.12)