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r to the power of ?

Forums › Ask ACCA Tutor Forums › Ask the Tutor ACCA PM Exams › r to the power of ?

  • This topic has 1 reply, 2 voices, and was last updated 8 years ago by John Moffat.
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  • Author
    Posts
  • February 20, 2018 at 2:53 pm #438133
    chrisi04
    Member
    • Topics: 49
    • Replies: 23
    • ☆☆

    The times taken to produce each of the first 4 batches of a new product were as follows:

    batch number time taken
    1 100mins
    2 70mins
    3 59mins
    4 55mins

    WHAT WAS THE RATE OF LEARNING CLOSEST TO? (1 d.p)

    The ANSWER is 84.3%

    I cannot understand how in his workings he did r to the power of 2.
    In my opinion it is r to the power of 3.

    Please help.

    February 21, 2018 at 10:17 am #438199
    John Moffat
    Keymaster
    • Topics: 57
    • Replies: 54835
    • ☆☆☆☆☆

    To make 4 units, we need to double twice.

    1 doubles to 2, 2 doubles to 4 – so doubling twice. Therefore it is r to the power 2.

    Again, please watch my free lectures on this.

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