I need help on these 2 micro questions:

Question 12 (4 points) The price of computers is expected to go down in the future. Holding everything else constant: O This causes a movement along the demand curve for computers. O This causes a shift in the demand curve for computers. Question 13 (4 points) When the price of bananas decreased from $3 to $1, the sales of bananas increased by 20%. Price elasticity of demand of bananas , calculated using the midpoint method (this is the same as the arc elasticity method), is _