Solution:
Using the mid-point method:
"=\\frac{600 -800}{(600+800)\/2 } \\div \\frac{250 -200}{(250+200)\/2 }"
"=\\frac{-200}{700 } \\div \\frac{50}{225 }"
"=\\frac{-0.29}{0.22 } = -1.32"
= 1.32
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