# Question: q 19 1p 2ps where p is...

###### Question details

Q = 19 - 1P + 2P_{S}

where P is the price of the product and

Ps the price of a substitute good.

The price of the substitute good is $2.00.

Suppose

P=$0.90

The price elasticity of demand is?

Please walk me through the quantity calculation as well, I'm struggling to get the right answer. Thank you!