1990 AMC 8 Problem 13
Attempt Problem 13 of the 1990 AMC 8 below, then check your answer against the professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 1990 AMC 8 solutions, or check the answer key.
All problems are used with official legal permission of the Mathematical Association of America (MAA).
13.
One proposal for new postage rates for a letter was ¢ for the first ounce and ¢ for each additional ounce (or fraction of an ounce). The postage for a letter weighing ounces was
¢
Answer: C
Small hint:
The first ounce costs ¢; the remaining ounces are billed as full additional ounces
Big hint:
A fraction of an ounce counts as a whole additional ounce, so ounces beyond the first counts as
Solution:
The first ounce costs ¢. The remaining ounces are charged as additional ounces, since any fraction rounds up to a full ounce.
That is ¢ ¢, so the total is ¢ ¢ ¢
Thus, the correct answer is C .
Problem 13 in other years
- 1985 AMC 8
- 1986 AMC 8
- 1987 AMC 8
- 1988 AMC 8
- 1989 AMC 8
- 1991 AMC 8
- 1992 AMC 8
- 1993 AMC 8
- 1994 AMC 8
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