Correct option is: (4) 700 apples
The Seller sells 40% of this apples.
After selling, he still has 420 apples.
The 420 apples represent 60% of his original Stock (Since he sold 40%).
If 60% of the original stock equals, then 1% can be calculated by dividing 420 by 60.
Hence, \(1\% = 420 \div 60 =7 \ \text{apples} \)
Now, to find the total original stock (100%), the amount per 1% is multiplied by 100.
Therefore, the original amount \(= 7 \times 100 = 700 \ \text{apples}\) .
Therefore, originally, he had 700 apples.
