AMC 8 1990 Problem 13

AMC8 1990 年第 13 题

方程与不等式★★★☆☆

Problem One proposal for new postage rates for a letter was

30\cent

for the first ounce and

22\cent

for each additional ounce (or fraction of an ounce). The postage for a letter weighing 4.5 ounces was

一项新的信件邮资方案为：首盎司 30 美分，之后每盎司（或部分盎司）22 美分。一封重 4.5 盎司的信件邮资为

正确答案 · Correct Answer

解析 · Solution

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