A began business with Rs.45000 and was joined afterwards by B with Rs.36000. When did B join if the profits at the end of the year were divided in the ratio of 2:1? Options:  A) 1.5  B) 6  C) 7.5  D) 8.5  E) 2
45*12 : 36*x = 2: 1   x = 7.5   12 -7.5= 
<gadget id="calculator">12 -7.5</gadget>
<output>4.5</output>
4.5   Answer: 7.5
<result>C</result>
A began business with Rs.45000 and was joined afterwards by B with Rs.36000. When did B join if the profits at the end of the year were divided in the ratio of 2:1?