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Produce an additional 7 units

Forums › Ask ACCA Tutor Forums › Ask the Tutor ACCA PM Exams › Produce an additional 7 units

  • This topic has 4 replies, 3 voices, and was last updated 1 year ago by John Moffat.
Viewing 5 posts - 1 through 5 (of 5 total)
  • Author
    Posts
  • June 5, 2021 at 11:58 pm #623339
    ythomas
    Participant
    • Topics: 15
    • Replies: 18
    • ☆

    I got this question from the mock exam.

    A company is starting to produce a new product. The first unit takes 42hrs to produce and the company has identified a learning rate of 80%.

    How long will it take to produce an additional 7 units (to the nearest hour)?

    Average time per unit for 8 units = 42 x (0.80)^(3) = 21.504hrs

    Total time for 8 x 21.504= 172hrs

    Time for additional 7 units = 172 – 42 = 130hrs

    My question was why are they multiplying 0.80 to the root of 3?

    June 6, 2021 at 3:07 am #623345
    Abhinav1608
    Participant
    • Topics: 4
    • Replies: 4
    • ☆

    It is not multiplied by the root of 3 but to the power of 3.
    You can get the answer by 42*0.8*0.8*0.8 in the calculator (=21.504 hours).
    Rest of your calculation is correct.

    June 6, 2021 at 9:49 am #623387
    John Moffat
    Keymaster
    • Topics: 56
    • Replies: 51585
    • ☆☆☆☆☆

    Abhinav: Please do not answer questions in this forum because it is the Ask the Tutor Forum and you are not the tutor (but please do help people in the there Paper PM forum) 🙂

    ythomas: Abhinav is correct in the it is to the power of 3 and not the root of 3. The reason it is to the power of 3 is that making 8 means doubling 3 times.

    June 6, 2021 at 10:20 am #623402
    ythomas
    Participant
    • Topics: 15
    • Replies: 18
    • ☆

    Apologies… I meant power of 3…

    But how will I know in the exam what power to times it by?

    June 6, 2021 at 4:09 pm #623460
    John Moffat
    Keymaster
    • Topics: 56
    • Replies: 51585
    • ☆☆☆☆☆

    I answer this in my previous reply.

    We are using the doubling rule, and making 8 is doubling 3 times. So it is to the power of 3.

    I do suggest that you watch my free lectures on this because it is all explained in detail, with examples, in my lectures on learning curves.

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