Posted by John on Wednesday, June 3, 2009 at 12:53pm.
It's better to use "on" with "computer" or "the computer" or "a computer."
The sentences are correct and mean approximately the same thing -- with few differences.
You can use either "used" or "second-hand" to describe the computer in #4.
The visual image of drawing a chart "on the computer" could be confusing. For example, I have "Post It" notes on my computer. I assume that you drew the chart on the monitor screen rather than the computer body. For this reason, although "on" is adequate, I would suggest using "with" since it is the instrument used in making the chart. Example 4 is better at clarifying this.
Since the cost is not related to being able to draw a chart (#1), I would suggest breaking it up into two sentences.
I hope this helps a little more. Thanks for asking.
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