An exclusive tourist resort charges tourists \(b\) dollars for the first night stay and charges a reduced rate of \(c\) dollars for every subsequent night of stay. How much does the tourist resort charge tourist for the first night stay?

1) Adam was charged \(390\) dollars for his \(6\) nights stay

2) The average (arithmetic mean) daily room rent for \(3\) nights' stay is \(7/9\)th times the rate for the first-night stay

The OA is C