An external payroll processing firm has offered these services to Chameleon at a cost of $1,350 per month. The outside firm will provide all supplies. However, if Chameleon used the outside firm, its accountants who currently process payroll would be reassigned to other projects (i.e. the accountants’ labor is unavoidable). Common fixed overhead is also not avoidable. How much would monthly costs be affected if Chameleon, Inc. switched to the payroll processing firm?