An investor can sell her MicroTron stock for 36$ per share and her Dynaco stock for 60$ per share, If she sells 300 shares altogether, some of each stock, at an average price per share of 40$, how many shares of Dynaco stock has she sold? Choose the correct option
A) 50
B) 75
C) 92
D) 136
E) 184
w1/w2 = (A2 - Aavg)/(Aavg - A1) = (60 - 40)/(40 - 36) = 20/4= 
<gadget id="calculator">20/4</gadget>
<output>5</output>
5/1= Number of MicroTron stocks/Number of Dynaco stocks   So for every 5 MicroTron stock, she sold 1 Dynaco stock.   So out of 300 total stocks, (1/5)th i.e. 300/6 = 50 must be Dynaco stock.   50nswer (50)
<result>A</result>
An investor can sell her MicroTron stock for 36$ per share and her Dynaco stock for 60$ per share, If she sells 300 shares altogether, some of each stock, at an average price per share of 40$, how many shares of Dynaco stock has she sold?