A & B start a business jointly. A invests Rs 16000 for 8 month & B remains in a business for 4 months. Out of total profit, B claims 2/7 of the profit . How much money was contributed by B ?
Choose the correct answer:
A) 11200	B) 12000	C) 12400	D) 12800	E) None of these
Explanation :   B's share = 2/7 of the profit   =&gt; A : B = 5 : 2   (We can easily find out A:B as given above by doing quick mental calculations   and it will be excellent if you can do as much as mental calculations possible.   Just for explanation, see below steps to systematically find out A : B   Let the total profit = x   B's share = 2x/7   A's share = x – 2x/7 = 5x/7   A:B = 5x/7 : 2x/7 = 5:2)   Let the money contributed by B = b   Then A:B = 16000*8 : b*4 = 5:2   =&gt; (16000*8)/4b = 5/2   =&gt; b = (16000*8*2)/ (4*5) = 800*8*2= 
<gadget id="calculator">800*8*2</gadget>
<output>12_800</output>
12800. Answer : Option 12800
<result>D</result>
A & B start a business jointly. A invests Rs 16000 for 8 month & B remains in a business for 4 months. Out of total profit, B claims 2/7 of the profit . How much money was contributed by B ?