Production cost of 1500 watches = Rs 255000
the number of watches that he must sell during the season = x
So number of watches sold after the season = 1500 - x
Therefore Amount Realized on the sale of 1500 watches or SP = x * 250 + (1500 - x) * 100
From this statement ( the number of watches that he must sell during the season in order to break even, given that he is able to sell all the watches produced.)
Break even is achieved if selling price = production cost
Therefore, x * 250 + (1500 - x) * 100 = 255000
x = 700
Option B is the Correct Answer