Monthly increase

[Elmo9]

I need a formula in my excel sheet that increases in value by 2.16 every month.
e.g. if cell A2 is "5" in January it must automaticly be "7.16" the first of February and "9.32" the first of March and so on.
Is there any formula to make this happen?
If a parameter to get yesterdays month existed I could use =IF(MONTH(TODAY())>MONTH(YESTERDAY()),A2+2.16,A2 to do so but the MONTH(YESTERDAY()) does not exist to my knowledge...
Any help is welcome

 

[Elmo9]

Shorter solution:

=A1+2.16*(MONTH(TODAY())-1)

Yes this is even shorter. And simpler as I don't need the IF part. Thanks.