A taxicab charges $1.50 for the flat fee and $0.50 for each mile. Write an inequality to determine how many miles Sharon can travel if she has $25 to spend.

$0.50 + $1.50x ≤ $25
$0.50 + $1.50x ≥ $25
$1.50 + $0.50x ≤ $25
$1.50 + $0.50x ≥ $25