Math question: How much would a ride of 10.6 miles cost not counting the tip

A taxi company charges $1.50 for the first mile and $.25 for each additional half mile or portion of a half a half a mile.How much would a ride of 10.6 miles cost, not counting a tip?
Please explain how you got the answer! Thanx!!

$1.50 + $4.75 + $0.25 = $6.50.