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Problem on market demand for chewing gum

The market demand for the chewing gum is as:

QG = 300 – 40PG – 8PS + 0.05I

Here:
QG = Quantity of gum demanded
PG = price of gum
PS = price of soda
I = average income in the market

Suppsoe that PG = $2, PS = $3, and I = $35

a. How much gum is required or demanded? 

b. Determine the cross-price elasticity of demand between soda and gum?

c. Are soda and gum complements or substitutes ? And how do you know? 

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