Errie owns a water pump. Because pumping target amounts of water is harder than pumping small amounts, the cost of producing a bottle of water rises as he pumps more. Here is the cost he incurs to produce each bottle of water:

a From this information, derive Ernie's supply schedule. Graph his supply curve for bottled water. b If the price of a bottle of water is $2.50, how many bottles does Ernie produce and sell? How much producer surplus does Ernie get from these sales? Show Ernie's producer surplus in your graph.