The constant elasticity of demand for cigarettes has been estimated to be 0.5.To reduce smoking by 75%， approximately how much tax needs to be added to a $1 pack？

The constant elasticity of demand for cigarettes has been estimated to be 0.5.To reduce smoking by 75%， approximately how much tax needs to be added to a $1 pack？
A.$0.38
B.$0.75
C.$1.5
D.$2.25
正确答案：$1.5