As a result , his monthly wages quadrupled from three gulden to twelve and a half .
A hard - working teacher despite poor pay , within several years Sudirman had become headmaster despite not having a teacher 's certificate .
Sudirman 's monthly wages quadrupled from three gulden to twelve and a half .
A hard - working teacher despite poor pay , within several years Sudirman had become headmaster despite not having a teacher 's certificate .