Chang Industries has 1,700 defective units of product that have already cost $13.70 each to produce. A salvage company will purchase the defective units as they are for $4.70 each. Chang's production manager reports that the defects can be corrected for $6.30 per unit, enabling them to be sold at their regular market price of $20.40. The incremental income or loss on reworking the units is:

$15,980 loss.

$15,980 income.

$10,710 loss.

$26,690 income.

$23,970 income.