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Full question attached
Answer:
Not elastic
Explanation:
The formula for demand elasticity= percentage change in quantity/percentage change in price
Therefore demand elasticity = Q2-Q1/Q2+Q1/2/P2-P1/P2+P1/2
Using graph of demand attached
= 12-15/12+15/2/21-15/21+15/2
= -3/27/2/6/36/2
=-2/9/1/3
=-2/3
=-0.67
Elasticity is less than one and so demand is inelastic