Answer:
 $280 for the bike
Step-by-step explanation:
If the relative values were ...
 bike : accessories = 8 : 1
Then the ratio of the bike to the whole amount is ...
 bike : total sale = 8 : (8+1) = 8 : 9
That is, the money Tedesco received for the bike is 8/9 of the total he received:
 bike money = (8/9)×$315 = $280