Excel formula query

Hi 

I generally only use Excel for basic stuff, but need to calculate some price differentials for a client.

I have some data of fuel prices on specific dates and need to fill in a column with the same price where our client paid a higher prices when buying fuel many times each day.

For instance, on 01 May 2019 the bulk fuel price was say £1.25 per litre and our client made several trips on the day. I need to fill in all of the cells for the day in question wit the bulk price.

I've attached a file that should explain it easier

Thanks in advance for your help

Marc