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Sir on the topic of linear programming when it comes to the iso profit line I dnt understand clearly whether we make an estimate or there is still a tactical way of coming up with that profit
All we need is the angle of the line, and so any figure for the contribution will be OK (because the angle will be the same whichever figure you choose).
If you watch the free lecture on linear programming, then in it I do suggest how to choose a figure that makes sure you can end up with a decent line which fits OK on the graph, without wasting time.
However, most likely these days is that instead of asking you to actually prepare a graph (although this can be asked) is to ask you to interpret a graph already drawn for you, so as to prove that you understand what the various lines represent.
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