As a result of the demand increasing only slightly compared to the reduction in price, the demand must be inelastic.
The demand is considered to be inelastic if the price elasticity is less than 1.
The price elasticity is:
= (%Change in quantity/% Change in price)
Solving gives:
= 15 / 200 ÷ 0.50 / 3.50
= -0.525
In conclusion, the demand for the shakes is inelastic.
Find out more on inelastic demand at https://brainly.com/question/1899986.