1988 AMC 8 Problem 12

Attempt Problem 12 of the 1988 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 1988 AMC 8 solutions, or check the answer key.

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12.

Suppose the estimated $20$ billion dollar cost to send a person to the planet Mars is shared equally by the $250$ million people in the U.S. Then each person's share is

$40

$50

$80

$100

$125

Answer: C

Concepts:place value

Difficulty rating: 730

Solution:

Each person's share is $\dfrac{20 \text{ billion}}{250 \text{ million}} = \dfrac{2 \times 10^{10}}{2.5 \times 10^{8}}.$

This equals $.8 \times 10^{2} = 80.$

Thus, the correct answer is C .

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