Mangoes are bought at a rate of 11 for Rs. 100 and an equal number at a rate of 9 for Rs. 100. If all the fruits are sold at 10 for Rs. 100, then what is the gain/loss % in all transactions?

1% Profit

                Qty     :     Price

Buy₁ ⇒     11       :     100      ..........(i)

Buy₂ ⇒      9        :     100      ..........(ii)

ATQ, making qty equal⇒ (i) × 9 & (ii) × 11

                Qty     :     Price

Buy₁ ⇒     99      :      900

Buy₂ ⇒     99      :     1100    

Buy  ⇒    198      :      2000      ( Buy₁ + Buy₂)

Sale ⇒     10       :       100       (multiply by 20 to make S.P & C.P. equal)  

Sale ⇒     200     :      2000

So, Loss = 200 - 198 = 2 mangoes on selling 200 mangoes

Therefore, Loss % = \(\frac{2}{200}\) × 100 = 1%