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Four different questions all get called "percentage", and mixing them up is the usual cause of errors. Finding a percentage of a number, expressing one number as a percentage of another, measuring change between two numbers, and adding a percentage on top are each handled separately here.
Choose the increase or decrease option, enter the old value first and the new value second. A negative result means it fell.
Going from 10 percent to 12 percent is a rise of two percentage points, but a twenty percent increase. Reports often confuse the two.
Use the second option: marks obtained is X, total marks is Y.