Answer:
c. 2.71, and supply is elastic.
Step-by-step explanation:
The formula to compute the price elasticity of supply is shown below:
Price elasticity of supply = (Percentage change in quantity supplied ÷ percentage change in price)
where,
Change in quantity supplied is
= Q2 - Q1
= 100 t-shirts - 75 t-shirts
= 25 t-shirts
And, an average of quantity supplied is
= (100 + 75) ÷ 2
= 87.5
Change in price is
= P2 - P1
= $20 - $18
= $2
And, the average of price is
= ($20 + $18) ÷ 2
= 19
So, after solving this, the price elasticity of supply is 2.71