Maintenance supervisor says that it will cost an extra $526 to reconfigure the used pump for the new use. The used pump could be sold (as is) for $3,711. How much cheaper or more expensive would it be to use the stainless steel pump rather than a new brass pump (Hint: it is assumed that stainless steel pump will be sold if it is not installed) ? Margin of error: +/-5 (answers within range [x-5, x+5], where x is the true answer, are considered correct).