First pack $20 Second pack $15 Third pack $10 Fourth pack $8 Fih pack $5 The table above shows each smoker's willingness to pay for a pack of cigarettes (each smoker's WTP schedule is identical to the others). If the price per pack is $7 (assume the supply curve is perfectly elastic), how many packs did each smoker buy and what is her consumer surplus (CS)? O 3 packs and CS=$17 O O O 3 packs and CS=$18 4 packs and CS=$25 4 packs and CS=$20