Herb owns a metal working business, from which he draws a salary of $40 per hour. Herb needs a custom metal press, but he could not find what he wanted on the market, so he modified an existing press that he purchased years ago for $6,800. He spent $400 on additional supplies and spent 30 hours doing the conversion. What is the capital cost of the press for CCA purposes?

a) $4,200

b) $6,800

sc)$7,200

d) $8,400