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23 November, 01:21

if p is 2% of k. What is 50% of k intems of P and k and if 10% of a number is 7. What is 80% of the number?

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  1. 23 November, 02:29
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    a. p/100

    b. 56

    Step-by-step explanation:

    2% of p=k

    2/100 * p=k

    2p/100=k

    Cross multiply 2p=100k

    P=100k/2

    p=50k

    Let's make k the subject of formula

    k=p/50

    So 50% of k in terms of p

    50/100*k

    And k=p/50

    So let's substitute

    50/100*p/50

    P/100

    Therefore 50%of k=p/100

    Let the unknown number be x

    10% of x is 7

    10/100*x=7

    10x/100=7

    Cross multiply

    10x = (100) (7)

    10x=700

    Divide both sides by 10

    X=70

    So 80% of 70

    80/100*70

    5600/100

    =56

    Therefore 80% of 70=56
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