I am going to travel to Macao without invitation letter.Is there any problem(How much money is need)

1.If you come to Macao for tourism, no invitation letter is needed. You are required to make visa applications in advance at the consulate or embassy of China located at your place of residence.
2.I am not sure the amount about the fee, but I suggest you prepare sufficient to cover your expenditure for your travel. General rate is USD 100 per day. So better try to enquiry the consulate or embassy directly about this.