https://docs.google.com/document/d/1BfjdmBDG-7s2dlBNDSgE8LuVAbvTPZoF9ttc-wUUZpI/edit

(Plong in your next query here. Can be in text or images:)

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6/21/2018 15:54:37

(a)

(b)

June         →        ------------- (1)

July         →         ------------- (2)

(2)-(1):          

Substitute into (1):

(c)        Salary equation now becomes