What is the net cost of $2008 less 10/5/20

Series Discount = 10% / 5% / 20%
Compliments of Series Discount = (1-.10) / (1-.05) / (1-.20)
Compliments of Series Discount = .90 / .95 / .80
Net Cost Equivalent = .90 (.95) .80
Net Cost Equivalent = 68.40%

Net Cost = Net Cost Equivalent X (List Price)
Net Cost = 68.40% X ($2008)
Net Cost = $1373.47