A certain database charges users a registration fee of x dollars, and if charges registered users y dollars per file downloaded. If there are no other charges for users of this database, what is the amount of the registration fee? (1) The total charge to download 50 files is $150, including the registration fee. (2) The total charge to download 100 files is $225, including the registration fee.

A certain database charges users a registration fee of x dollars, and if charges registered users y dollars per file downloaded. If there are no other charges for users of this database, what is the amount of the registration fee? (1) The total charge to download 50 files is $150, including the registration fee. (2) The total charge to download 100 files is $225, including the registration fee.