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Incorrect sampling is when the wrong data or sample of something is taken or given during the testing or information gathering in a project, experiment, or work. Examples may include gathering soil samples instead of water samples.
It is called a discount, and is normally a percentage of the regular sales price.
61.78 x 5/4 = 77.23
He gave away 3000 pens
64.00 is 80% of normal so normal price is 5/4 x 64 = 80.00