Add cable (12 inches) 1ft = $.85 2ft = $1.70 (+.85) 3ft = $2.55 (+1.70) 4ft = $3.40 (+2.55) 5ft = $4.25 (+3.40) 6ft = $5.10 (+4.25) 7ft = $5.95 (+5.10) 8ft = $6.80 (+5.95) 9ft = $7.65 (+6.80) 10ft = $8.50 (+7.65) 11ft = $9.35 (+8.50) 12ft = $10.20 (+9.35) 13ft = $11.05 (+10.20) 14ft = $11.90 (+11.05) 15ft = $12.75 (+11.90) 16ft = $13.60 (+12.75) 17ft = $14.45 (+13.60) 18ft = $15.30 (+14.45) 19ft = $16.15 (+15.30) 20ft = $17.00 (+16.15) 21ft = $17.85 (+17.00) 22ft = $18.70 (+17.85) 23ft = $19.55 (+18.70) 24ft = $20.40 (+19.55) 25ft = $21.25 (+20.40)