8500
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4100 ((4200 + 4000)/2)
4500
3500
It is: 4000 --------------------------- 5000 - 3000 = 2000 and 2000/2 = 1000, so 3000+1000 = 4000 and 5000-1000 = 4000 The easiest way to find the halfway point (the average): add the two numbers and divide by 2.
0.5*(2500 + 5500) = 4000