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prealgebra junior

Problem

One proposal for new postage rates for a letter was cents for the first ounce and cents for each additional ounce (or fraction of an ounce). The postage for a letter weighing ounces was
(A)
(B)
(C)
(D)
Solution
After the first ounce, there are ounces left. Since each additional ounce or fraction of an ounce adds cents to the total cost, we need to add to the cost for the first ounce. So, the total price is cents. The answer is choice .
Final answer
C