I need to return a value of 10% or 20% depending on the value of a date in another cell to determine a deposit value depending if the date is is in Winter or Summer.

For example the deposit will be 10% if a date falls in Winter determined by the MM value in an adjoinig date field cell.

Therefore if the MM value from (DD-MM-YY) is 11-12-01-02-03 the deposit cell will reflect 10% and any other MM value will reflect 20% for Summer.

Appreciate any help on this as this is way above my knowledge of functions/formulas.

Thanks in advance