Amazing Calculation: Do It, Its Really Interesting

Mga katropa try your mathematical skill with this computation that will result on your birthday.... Start now!!!

4 x Ur birth date

+ 13

x 25

- 200

+ month u r born

x 2

- 40

x 50

+ last 2 digit of year u born

- 10500 = ???

Result = DD/MM/YY (I am right?)