Answer: Approximately 2.37
Elastic over this range
Explanation: As we know that, as per the midpoint method elasticity of supply is calculated as :-
[tex]Elasticity\:=\:\frac{Q2-Q1}{P2-P1}\times \frac{P2+P1}{Q2+Q1}[/tex]
where,
Q2 = 19
Q1 = 10
P2 = 65
P1 = 50
now, putting the values into equation we get :-
[tex]Elasticity\:=\:\frac{19-10}{65-50}\times \frac{65+50}{10+19}[/tex]
= 2.37
So, we can say that over this range Ginny's supply is elastic .