SOLUTION: A bank has two checking plans. Plan A charges .30 per check, Plan B charges 2.40 per month plus .18 per check. What number of checks will plan B cost less?

Hi

Plan A charges .30 per check, Plan B charges 2.40 per month plus .18 per check.

Let x represent the number of checks

What number of checks will plan B cost less?

    2.40 + .18x < .30x

         2.40 < .12x

           20 < x

  When the number of checks written > 20, Plan B will cost less.

CHECKING our Answer***

  $2.40 + .18*21 < $6.60

  $2.40 +  $3.78 < $6.60

        $6.18 < $6.60