The net adjustment is $18,000: $15,000 - $6,000 + $9,000. The adjusted sale price is $363,000: the original $345,000 sale price plus that $18,000 net change. Do not report the adjustment total as though it were the property's entire indicated value.

If the question also asks for gross adjustment, add the absolute amounts: $15,000 + $6,000 + $9,000 = $30,000. The three answers therefore have different labels: $18,000 net adjustment, $30,000 gross adjustment, and $363,000 adjusted sale price.

These amounts are supplied only for arithmetic practice; they are not standard appraisal allowances. Write the labels first, then calculate the numbers. The sales-comparison worksheet shows how the signs are chosen before adding them.