1.

A number is increased by 18%. To obtain the old number, by how much percentage should it be decreased?1). 16.882). 15.253). 17.34). 14.28

Answer»

Given,

A number is INCREASED by 18%

Let number be n.

NEW number =

= n + n × (18/100)

= 59n/50

To obtain OLD number,

Let PERCENTAGE number should be decreased to obtain new number be a.

n = 59n/50 - (59n/50) × (a/100)

n = (5900n - 59na)/5000

5000n = 5900n - 59na

59na = 900n

a = 900n/59n

a = 15.25

By 15.25% new number should be decreased to obtain new number.


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