Question

A businessman sold two-thirds of his stock at a gain of 20% and the rest at a gain of 14%. Find the gain percentage of the businessman.

Answer 1

since he sold in the means of 2/3 and 1/3, take any number which is divisible by 3. lets take 90.2/3 of 90 is 60. so 20% profit of 60 is 72 which is 12 gain.same goes for 1/3 of 90 is 30. so 14% profit of 30 is 4.2 gain.Total gain is 12+4.2 = 16.2 calculate profit % 16.2 * 100/90 = 18%

Answer 2

s (38/105)³-(1/35)³-(1/3)³=38/3675,how will you justify your answer without doing actual calculation