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Sagot :
Answer:
D) $27
Step-by-step explanation:
You want an estimate of a reasonable amount to pay for 10 gallons of gas at $229 per gallon, and 2 quarts of oil at $1.89 per quart.
Estimate
For estimating purposes, we like to round numbers to 1 or 2 significant figures.
The cost of 10 gallons of gas is about 10 × $2.30 = $23.
The coast of 2 quarts of oil is about 2 × $2 = $4.
So, the total cost of the gas and oil is about $23 +4 = $27.
You expect the total to be near $27.
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Additional comment
Part of estimating is estimating the error in your estimate. Here the error is $0.01 per gallon of gas, or $0.10 for 10 gallons. The error is $0.11 per quart of oil, so $0.22 for 2 quarts. The final estimate of $27 is $0.10 +0.22 = $0.32 too high. $27 is different from the next answer choice by $2, so is still the best answer choice.
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