Which of the following expressions does not represent “increase a quantity n by 25%”?
A. n + 0.25n
B. (1 + 0.25)n
C. 125n
D. 1 1/4 n ( one and one forth n)

Option C) 125n is the expression that does not represent “increase a quantity n by 25%

Step-by-step explanation:

The given expressions are for the quantity n which is increased by 25%.

Option A) n + 0.25n

Put n = 100,

⇒ 100 + 0.25(100)

⇒ 100 + 25

⇒ 125

So, option A) represents the given condition.

Option B) (1 + 0.25)n

Put n = 100,

⇒ (1+0.25) 100

Multiply 100 with each terms inside the bracket.

⇒ 100 + 25

⇒ 125

So, option B) represents the given condition.

Option C) 125n

Put n = 100,

⇒ 125 × 100

⇒ 12500

So, option C) does not represents the given condition.

Option D) 1 1/4 n

Put n = 100,

Convert the mixed fraction to proper fraction

⇒ (5/4) n

⇒ (5/4) 100

⇒ 500 / 4

⇒ 125

So, option D) represents the given condition.

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step-by-step explanation: