We will ignore the part "The startup division’s growth was 1/3 greater than the established division’s." because it doesn't give us relevant info.

Let

x = startup division total, x>0

y = established division total, y>0

The startup division made 80% of 1/2 of the established division:

x = 0.80*(1/2)*y

The divisions made $280,000 combined:

x + y = 280000

We have the following system of equations:

x = 0.80*(1/2)*y

x + y = 280000

........

click here to see all the system of equations solution steps

........

x = $80,000

y = $200,000

The startup division made $80,000.