$Q _ { d } = 100 - 5 P + 0.004 M - 5 P _ { R }$ ,where P is the price of good X, M is income, and $P _ { R }$ is the price of a related good, R.
-From the demand function it is apparent that related good R is

Question

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The Answer of   $Q _ { d } = 100 - 5 P + 0.004 M - 5 P _ { R }$ ,where P is the price of good X, M is income, and $P _ { R }$ is the price of a related good, R.
-From the demand function it is apparent that related good R is

Qd=100−5P+0.004M−5PRQ _ { d } = 100 - 5 P + 0.004 M - 5 P _ { R }Qd​=100−5P+0.004M−5PR​

$Q _ { d } = 100 - 5 P + 0.004 M - 5 P _ { R }$