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Chang Lu Yuquan brand clothing store did a social survey math problem.
Li Hui went to Yuquan brand clothing store to do social investigation. She learned that in order to motivate the sales staff, the mall implemented the method of "total monthly income = basic salary+piece rate bonus" and obtained the following information:

Assume that the number of pieces sold per month is X, and the total monthly income is Y yuan. For each piece sold, a reward is A yuan, and the monthly basic salary of sales staff is B yuan.

(1) Find the values of a and b;

(2) If the monthly income of Xiao Li, the shop assistant, is not less than 1800 yuan, how many clothes will Xiao Li sell this month at least?