If old basic pay is 5000 what will be the basic pay in 6th pay?

one teacher join to nov 2003 tgt grade. basic pay 2005 nov-5850, and second teacher join to feb-2004 tgt. feb-2005 basic pay- 5675.

what is two teacher new pay scales 2006

tgt scales- 17140(12540+4600=17140)

please fix the pay