A Business Begins a Year with 4,500 Office Machines and Finishes

A business begins a year with 4,500 office machines and finishes the year with 5,500 machines while writing off the value of 750 machines as depreciation.What is the amount of net investment that this firm has undertaken during this time period?

A) 1,000 machines
B) 750 machines
C) 250 machines
D) 1,750 machines
E) Impossible to calculate with the information given