Use the midpoint formula to calculate the elasticity of supply for golf balls

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Use the midpoint formula to calculate the elasticity of supply for golf balls. On one weekend a golf ball manufacturer produced 80,000 sleeves of golf ball priced at $12 a sleeve. The following weekend, the price of the sleeves was reduced to $10 and the manufacturer produced 60,000 sleeves were sold. The for golf balls is equal to:

A. 0.128

B. 0.778

C. 1

D. 1.28