Last month measure versus same month last year measure .. difference & % difference

[MarcUrdang]

Hi there .. I am a new PBI user and learning the ropes. Can you advise how to manage the following: link below

https://drive.google.com/open?id=19egocOe4BDzkAXOaoX-moUvTzBeaUeug

I have a created a number of visuals. Two of them show a measure for last month (4376) and for the same month last year (3870). I created these two cards by just using a filter to get the correct number. However now I would like to show the difference between the two and the % up or down.

I know that there might be a few ways to get the answer but looking for the most efficient.

Thanks so much,

Marc