Formula to calculate Fuel Consumption

I need some help in calculating automatically the fuel consumption per 100 kms in a worksheet that contains 31 rows (days of the month) and four columns as follows:
1. Date (representing each day of the month)
2. Fuel Tank filling in litres (usually shows 3-4 fillings in different days of the month)
3. Kilometres Reading at the moment of fuel tank top-up
4. The formula column, which needs to calcualate automatically the fuel consumption/100 kms whenever there are new entries in columns 2 and 3 as shown above.

Normally to calculate the fuel consumption/100 kms is:
x= litres x 100 kms / kms done

The kms done is calcualted by deducting the Current Kms Reading from the previous Kms Reading.

I have attached a zipped excel file as an example.

I would appreciate your help

Thanx