A cellular company purchased $28,600 in cell phones on April 25 . The terms of sale were 4/20,3/30,n/60. Freight terms wer F.O.B. destination. Returned goods amounted to $650. (a) What is the net amount due (in \$) if the cellular company sends the manufacturer a partial payment of $6,000 on May 20? (Round your answer to the nearest cent.) (b) What is the net date? (c) If the manufacturer charges a 421% late fee, how much (in \$) would the cellular company owe if it did not pay the balance by the net date? (Round your answer to the nearest cent.)