An investor can sell her MicroTron stock for 36$ per share and her Dynaco stock for 48$ per share, If she sells 300 shares altogether, some of each stock, at an average price per share of 40$, how many shares of Dynaco stock has she sold?  Choose the correct choice from the following options:
A) 52 B) 75 C) 92 D) 100 E) 184
w1/w2 = (A2 - Aavg)/(Aavg - A1) = (48 - 40)/(40 - 36) = 8/4= 
<gadget id="calculator">8/4</gadget>
<output>2</output>
2/1= Number of MicroTron stocks/Number of Dynaco stocks   So for every 2 MicroTron stock, she sold 1 Dynaco stock.   So out of 300 total stocks, (1/3)th i.e. 300/3 = 100 must be Dynaco stock.   Answer (100)
<result>D</result>
An investor can sell her MicroTron stock for 36$ per share and her Dynaco stock for 48$ 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?