Question

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

$96$ ¢

$1.07

$1.18

$1.20

$1.40

Answer: C

Concepts:rate floor and ceiling functions

Difficulty rating: 930

Solution:

The first ounce costs $30$ ¢. The remaining $3.5$ ounces are charged as $4$ additional ounces, since any fraction rounds up to a full ounce.

That is $4 \cdot 22$ ¢ $= 88$ ¢, so the total is $30$ ¢ $+ 88$ ¢ $= 118$ ¢ $= \$1.18.$

Thus, the correct answer is C .

1990 AMC 8 Problem 13

Answer: C

Solution:

Problem 13 in Other Years