Percentages L1

If m% of m + n% of n = 2% of (m × n), then what percentage of m is n?

  1. 25%
  2. 50%
  3. 75%
  4. 100%

Answer

We need to calculate the ratio n/m.

According to the question, we have:

(m/100) × m + (n/100) × n = 2/100 × (mn)

⇨ m2/100 + n2/100 = 2 mn / 100  

Divide both sides by m2 and multiply by 100

So, 1 + (n/m)2 = 2(n/m)

Put (n/m) = x 

So, x2 - 2x + 1 = 0

 ⇨ (x - 1)2 = 0

⇨ x = 1

So, x = n/m = 1

⇨ n = m

Therefore, n is (100% of m) or equal to m.

The correct option is D.