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This is simple
If we divide the max score by 10 then we get 10 percent of the max score which is 80.
From there, 10*8=80 so 80*8=640 which is 80%
To find 90% we multiply 80 by 9 which is 720
So in conclusion the answers will be between 640 and 720
The answers are 710 and 645
Hope that helps