Book cost ; sunk cost. A cost incurrence where the cash expenditure has already occurred, such as the cost of depreciation for a machine purchased several years ago.
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define cost and selling price
Why dont you try looking in that biology book right next to you in your bag.
2.30
count it by 4
i would define the word compare as a number, angle, shape, ect. that is different and try to see what comparisons they have.