Answer: Approximately 2.37
Elastic over this range
Explanation: As we know that, as per the midpoint method elasticity of supply is calculated as :-

where,
Q2 = 19
Q1 = 10
P2 = 65
P1 = 50
now, putting the values into equation we get :-

= 2.37
So, we can say that over this range Ginny's supply is elastic .