Island Bikes will divide the original market into two submarkets: one in the morning and one in the afternoon. The first submarket consists of customers A through C and the second submarket consists of customers D through F. In the morning, Island Bikes will rent out 3 bikes and charge $12, and in the afternoon, Island Bikes will rent 2 out bikes and charge $6. The economic surplus on each bike is the consumer’s reservation price minus marginal cost. So total economic surplus is ($22 - $3) + ($16 - $3) + ($12 - $3) + ($8 - $3) + ($6 - $3) = $49.