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x=8
y=1

the percentage y of x is 1/8*100=100/8

the difference in percentage is 100-100/8=700/8=87.5

B

intuitively C is too simple, other unrealistic, so B fits
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Let's say "y" is a specific number,and "x" is 8 times y
i.e.
y
x=8y

The percentage that y is less than x is : (8y -y)/8y = 87.5%
The answer is B
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