If of a number is 84 , then of that number is:

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25.2

420

42000

2520

answer is C.

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Detailed Solution

Concept- Here, we employ the % idea, which denotes a portion of a total amount. By dividing the result by 100, the percentage sign (percent) is always used to represent percentages. Claim we can write

of a value as

and multiply it to the value of which we are calculating the percentage.
When any number is

of another number, then the first number is

times of the other number i.e.

i.e.

part of

Here as well, we compute the starting number using the unitary technique before determining the needed portion of the number. When using the unitary technique, we divide the total value by the number of units to get the value of a single unit, and we multiply the value of a single unit by the number of units to determine the value of multiple units.
Let the number be

.
Given,

of a number is 84

of the number

And

is given as 84
Equate

to 84, that is

Divide both sides of the equation by 0.06 and simplify.

Multiply both sides of the equation by 100 to obtain the value of x.

of the number implies

times the value of

.
Multiply

to the obtained value of