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Question:

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?

A
$21

Explaination

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.