When Mary earned $3,200 per month, she bought 2 concert tickets each month. Now her monthly income is $5,600, and the number of concert tickets she purchases has risen to 3 per month. Mary's income elasticity of demand for concert tickets equals ________ and the tickets are a(n) ________ good for Mary.
A. -0.21; inferior
B. +0.73; normal
C. -1.36; normal
D. +0.21; complementary
Answer: B
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