Mileage calculation help !

Petrol filled 16.5 liters
Petrol cost per liter RS. 73
Kilometers rode until bike stopped for lack of petrol 900 Kilometers..

Here I'm pretty much confused as how to calculate
1. Kilometers per liter of petrol and
2. Cost per kilometer rode

Help :)

900km÷16.5liters= 54.5454 km/liter
RS. 73 ÷ 54.5454km = 1.3383 RS./km

1. 900/16.5=54.54 km/L
2. 900/(16.5*73)=.747