A taxi charges $2.00 for up to and including the first mile, and $1.60 for each mile thereafter. What would the taxi charge for a trip of 4 miles?

The first mile costs $2.00, leaving 3 miles to be charged at $1.60 per mile.

3 * $1.60 = $4.80

Adding the cost for the first mile:

$2.00 + $4.80 = $6.80

Therefore, the taxi would charge $6.80 for a trip of 4 miles.