Answer:
$20,000
Explanation:
Based on the information given we were told that If she wants to sell six motor home she have to charge the amount of $20,000 for each of them which means that the QUALITY EFFECT of selling the sixth motor home is $20,000 which is the amount we were told she must charged If she wants to the sell six motor home.
Therefore The quantity effect of selling the sixth motor home is $20,000