TRY THIS!!

Iseng" berhadiah..
marii dicobaa!
Ambil tgl kelahiranmu
x4,
+13,
x25,
-200,
+bln lhrmu,
x2,
-40,
x50,
+2digit terakhir thn klhrn mu,
-10500.
SEE?
Dicoba ya..‎​
Rumus yg aneh.
But Amazing!‎​