A firm has two major customers - Betty and Bill. The firm assigns general delivery costs to customers based on the total value of orders placed. Last year Betty placed 100 orders at a total value of $49,980 and Bill placed 250 orders at a total value of $52,020. If total general delivery costs totaled $20,000, the amount assigned to Betty equals ______.

Multiple choice question.

$10,000

$10,200

$5,714

$9,800