AMC 8 1990 Problem 13

AMC8 1990 年第 13 题

方程与不等式★★★☆☆

One proposal for new postage rates for a letter was 30¢ for the first ounce and 22¢ 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

A.96¢
B.$1.07
C.$1.18
D.$1.20
E.$1.40

正确答案 · Correct Answer

解析 · Solution

Solution 1

There are 4.5-1=3.5 additional ounces, which would round up to paying for 4 additional ounces. Therefore, the total cost is

\$0.30 + 4 \cdot \$ 0.22 = \$1.18

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