A man was traveling abroad in a small red car. One day he left the car and went shopping. When he came back, its roof was badly damaged.

    Some boys told him that an elephant had damaged it. The man did not believe them, but they took him to a circus(马戏团) which was near there. The owner of the elephant said, “I am very sorry! My elephant has a big, round, red chair. He thought that your car was his chair, and he sat on it!"

    Then he gave the man a letter, in which he said that he was sorry and that he would pay for all the damage.

    When the man got back to his own country, the customs（海关） officers wouldn't believe his story. They said, “You sold your new car while you were abroad（国外） and bought this old one!"

    It was only when the man showed them the letter from the circus man that believed him.

解方程$\frac{2x+1}{3}-\frac{10x+1}{6}=1$时，去分母正确的是（　　）

公司投资750万元，成功研制出一种市场需求量较大的产品，并再投入资金1750万元进行相关生产设备的改进．已知生产过程中，每件产品的成本为60元．在销售过程中发现，当销售单价定为120元时，年销售量为24万件；销售单价每增加10元，年销售量将减少1万件．设销售单价为x（元）（x＞120），年销售量为y（万件），第一年年获利（年获利=年销售额﹣生产成本）为z（万元）．

（1）求出y与x之间，z与x之间的函数关系式；

（2）该公司能否在第一年收回投资．