Can I assume the grades salary range:

grade 6-->Engineer, fresh grad $3280(2nd lower) to $3880(1st class), as far as i know
grade 7-->Senior Engineer
grade 8-->
grade 9-->Principal engineer
grade 10-->
grade 11-->
grade 12-->Asst Director
grade 13-->Deputy Director
grade 14-->Director = COL rank approx
grade 15-->Deputy CE = BG rank approx
grade 16-->Chief Exe

can someone fill in the salary range for the rest?

How much increment % will it be when someone is promoted
from grade 6 to grade 7,
from grade 7 to grade 8 ??