Suppose an increase in the price of hamburger from $3 to $4 leads to an increase in quantity supplied from 100 units to 150 units. At the original price, the price elasticity of supply for hamburgers is _ so supply is _.
A.2/3; elastic
B.2/3; inelastic
C.3/2; inelastic
D.3/2; elastic
正确答案：3/2; elastic
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