1% = 1/100 means 1 inch drop over 100 inches of drain pipe
that is slightly more than 8 feet
1 in drop over 8 ft 4 in
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Grade equivalent score is interpreted by comparing the percentage to the actual letter grade given. In most instances a 90 percent or greater is equivalent to an A letter grade.
D+ one percent away from C- (70%)
In my school, its a B+. 85% or higher is an A.
C grade
That is an A- or an A