IF statement to highlight values crossing round and half round numbers

Hi all,

I am currently looking to automate a backtest for the foreign exchange market.

All currency pairs trade to four decimal points. I would like Excel to tell me when a value crosses a round number eg. 1.2800 and half round number eg. 1.2850.

I'm assuming the easiest way to do this would be by using an IF statement, but I have limited experience with formulas in Excel.

I have attached an example spreadsheet.