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Mathematics
05.01.2022 23:13
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retail price is R499.95 and cost price is R139.95. can you help with the % mark

retail price is R499.95 and cost price is R139.95. can you help with the % mark up for the product sold
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Porciabeauty6788
Porciabeauty6788
5,0(32 marks)

20

21.75

27.85

29.5

Step-by-step explanation:

Arranging the values in ascending order we get

1621242427283035

n = Number of values = 8

Rank is given by

\dfrac{\text{Percentile}}{100}\times (n+1)

=\dfrac{20}{100}(8+1)=1.8

Taking the fraction of the rank i.e., 0.8 and work out the weighted mean

0.8\times (21-16)+16=20

The 20th percentile is 20

\dfrac{25}{100}(8+1)=2.25

0.25(24-21)+21=21.75

The 25th percentile is 21.75

\dfrac{65}{100}(8+1)=5.85

0.85(28-27)+27=27.85

The 65th percentile is 27.85

\dfrac{75}{100}(8+1)=6.75

0.75(30-28)+28=29.5

The 75th percentile is 29.5

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