The demand and supply schedule for coffee are:

Price ($ per cup)	Quantity Demanded	Quantity Supplied
$1	130	10
$2	110	20
$3	90	30
$4	70	40
$5	50	50
$6	30	60
$7	10	70
$8	0	80

a)     If there is no tax on coffee, what is the price and how much coffee is consumed

b)    What is the consumer surplus? Show your calculations

c)     What is the price elasticity of demand when the price goes up from $3 to $4 dollars? Is the demand for coffee elastic or inelastic? Explain.