There are a few possibilities. Each assumes that the cashier has been properly trained and can count change properly if the cashier tries.
1. He or she is in a rush to get to the next customer. While rushing to give you your change back he or she either gives you too much change or short changes you.
2. He or she receives an amount on the cash register that is not divisible by 5. He or she doesn't want to count pennies and either gives you too much or not enough. He or she may round down or up, but it's still bad business ethics.
3. He or she is aware of short changing customers and takes the exact amount out of the cash register at the end of the day so that the managers don't notice.
4. He or she is apart of management and randomly short changes some customers that he or she thinks will not care to count his or her change when receiving it.
There may be more.
To avoid this from happening you can make it a habit to count your change in front of the cashier. Once you walk away your credibility is gone so do it as soon as he or she hands it to you.
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your teacher give you short problem and then if you get it they might give you the long one so keep trying
Well, honey, if you give the cashier a ten dollar bill for something that costs less than ten bucks, you should expect some change back. Now, if the cashier is on their game, you should get back the difference between the cost of your purchase and the ten dollar bill you handed over. Simple math, my dear.
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Differentiation of the function would give you an instantaneous rate of change at one point; the tangent line. Repeated differentiation of some functions would give you many such points. f(x) = X3 = d/dx( X3) = 3X2 =======graph and see