2002 AMC 8 Problem 9

Attempt Problem 9 of the 2002 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 2002 AMC 8 solutions, or check the answer key.

All problems are used with official legal permission of the Mathematical Association of America (MAA).

9.

His South American stamps issued before the ‘7070s cost him
$0.40\$0.40
$1.06\$1.06
$1.80\$1.80
$2.38\$2.38
$2.64\$2.64
Answer: B
Concepts:data and graph interpretationmoney
Small hint:
South American means Brazil and Peru.
Big hint:
Before the ‘7070s means the ‘5050s and ‘6060s columns.
Solution:
Brazil and Peru are the South American countries.
Brazil has 4+7=114+7=11 stamps before the ‘7070s, costing 11⋅6=6611\cdot6=66 cents. Peru has 6+4=106+4=10 such stamps, costing 10⋅4=4010\cdot4=40 cents.
The total cost is 66+40=10666+40=106 cents, or $1.06.\$1.06.
Thus, B is the correct answer.
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