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Any one tell me how to sum amount of the same cell in excel. ????

 

for example I wrote an amount Rs 50 in cell A1 .  and  the  next day i change this amount as 60 . But i wanna total of the previous amount(50)  &  current amount (60)  in cell A2. 

 

As the 3rd day i change the cell A1 with Rs. 80  .Now i wanna get total of these three amounts ( two previouse 50,60  & one recent 80)  in cell  A2 .

 

Plz guide me how it will done???????

 

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