Question 790365
Call the coworker's pay check c.<P>
Call your paycheck y.  y is 15% less than c, which is c(1-.15) or y=.85c<P>
Their sum is 880.  c + .85c = 880<P>
1.85c = 880<P>
c=880/1.85 = 475.68<P>
y = 475.68 * .85 = 404.32