Amanufacture of skateboards offered a 5/2/1 chain discount too many customers. bobs sporting goods ordered 20 skateboards for a total of $625 list price. what was the net price of the skateboards?

A discount string 5/2/1 means the following:
 1) Apply 5% discount to the original price.
 2) Apply 2% discount to the result of step 1).
 3) Apply 1% discount to the result of step 2).
 We have then that the result will be given by:
 625 * (0.95) * (0.98) * (0.99) = 576.05625 $
 Then, the price of each skateboard is:
 (576.05625) /20=28.8028125 $
 
 The net price of the skateboards was:
 28.8028125 $