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    In the January 2006 paper (MPC2) there is this question:Name:  Screen Shot 2013-01-05 at 15.54.45.png
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    I've done part a and b, but I don't understand how they get 75 for part c. Here's the mark scheme:

    Name:  Screen Shot 2013-01-05 at 15.56.23.png
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    Why did they use sum to infinity when it's talking about terms?

    At infinity the terms do not change so Un+1 = Un

    That means you can put L into both sides of your formula

    L=pL + q

    L=0.6L + q

    Because if L is the limit, Un+1 is still L so therefore Un+1= L.

    rearrange that to become 0.4L=q.

    L = 75 (assuming you sub the correct value of q)
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Updated: January 5, 2013
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