Four people each have a different willingness to pay for one unit of a good: George will pay $15, Glen will pay $12, Tom will pay $10, and Peter will pay $8. If price is equal to $9 per unit then the quantity demanded in the market will be ________ and the consumer surplus for this unit will be ________. (四个人每个人都有不同的愿望支付一个单位:乔治将支付15美元,格伦将支付12美元,汤姆将支付10美元,彼得将支付8美元。如果价格等于每单位9美元,那么市场需求的数量将是 _ _ _ _ _ _ _ _,而这个单位的消费者剩余将是 _ _ _ _ _ _ _ _。——中文由在线翻译而来,仅供参考)