Problem on market demand for chewing gum

The market demand for the chewing gum is as:

Q_G = 300 – 40P_G – 8P_S + 0.05I

Here:
Q_G = Quantity of gum demanded
P_G = price of gum
P_S = price of soda
I = average income in the market

Suppsoe that P_G = $2, P_S = $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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