Formula use kri bujai dile ki khoti hl hy . short cut method used kri ki bujabi sb pahori jbo sbe hokolo bor ata system t a hikhabo lge nhle bujai ki hbo jdi mnt a nthake mnuhr.
Sir percentage r jun khon talika disile 10 loike dia hoise jodi pare 20 loike di dbo sun aru kneke uliai xei niom tu xikai dibo tetia ji kunu number dia thakile uliabo parim