Which, if any, of the methods is technologically efficient? Four methods of completing a tax return and

Question:

Which, if any, of the methods is technologically efficient?
Four methods of completing a tax return and the time taken by each method are: with a PC, 1 hour; with a pocket calculator, 12 hours; with a pocket calculator and paper and pencil, 12 hours; and with a pencil and paper, 16 hours. The PC and its software cost $1,000, the pocket calculator costs $10, and the pencil and paper cost $1.