This formula uses a series of nested IF statements to return a string based on the value in the [SEMUA] field. It will return "TIDAK LAYAK" if [SEMUA] is less than 90, "GANGSA" if [SEMUA] is less than 180, "PERAK" if [SEMUA] is less than 270, "EMAS" if [SEMUA] is less than 360, and "NILAM" if [SEMUA] is less than 10,000. Otherwise it will return an empty string.