Let the price elasticity of demand for a soft drink be - 2.In the year 2005, the per capita consumption of soft drinks was about 500 cans per person, and the average price was $1.00 per can.If we suppose that demand for the soft drink is linear, Q^d = a - bP, where a and b are constants, Q^d is quantity demanded and P is price, an estimate of the demand equation could be:

a.Q^d =100 - 2P

b.Q^d =1500 - 2P

c.Q^d =1500 - 1000P

d.Q^d =1000 - 1500P

e.Q^d =100 - 15P