PURCHASE A SHARE OF STOCK OF $50 AT T0, 
AND PURCHASE ANOTHER SHARE OF STOCK AT $65 AT T1, 
AT THE END OF YEAR 1 AND 2, THE STOCK PAID $2 DIVIDEND. 
ALSO AT THE END OF YEAR 2, INVESTOR SOLD BOTH SHARES FOR $70 EACH. 
  
SOLVE FOR TIME-WEIGHTED RATE OF RETURN 
  
ANSWER: hpy1 = (65+2-50)/50-1=34% 
HYP2=(144-130)/130-1=10.77% 
  
不明白130 是咋来的? 
  
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