A taxi ride costs $3.00 for the first mile and $1.00 each additional half mile. What is the cost of a 10-mile ride?
$21
$10
$12
$13
Detailed Explanation
In a 10-mile trip, after the first mile, there are 9 additional miles. If each additional half mile is 1, then an additional mile is 2. The cost of the trip is 3 for the first mile + (2 × 9) for the additional miles. 3 + 18 = 21.
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