what was the difference in cumulative total return for the five year period ending 12/31/07 between a o smith corp and the s&p smallcap 600 index?
the graph below shows a five-year comparison of the cumulative shareholder return on the company's common stock with the cumulative total return of the s&p smallcap 600 index and the s&p 600 electrical equipment index , all of which are published indices . comparison of five-year cumulative total return from december 31 , 2002 to december 31 , 2007 assumes $ 100 invested with reinvestment of dividends period indexed returns .

|  | BasePeriod | INDEXED RETURNS |
| :--- | :--- | :--- |
| Company/Index | 12/31/02 | 12/31/03 | 12/31/04 | 12/31/05 | 12/31/06 | 12/31/07 |
| A O SMITH CORP | 100.00 | 132.23 | 115.36 | 138.20 | 150.26 | 142.72 |
| S&P SMALLCAP 600 INDEX | 100.00 | 138.79 | 170.22 | 183.30 | 211.01 | 210.39 |
| S&P 600 ELECTRICAL EQUIPMENT | 100.00 | 126.12 | 152.18 | 169.07 | 228.83 | 253.33 |

12/31/02 12/31/03 12/31/04 12/31/05 12/31/06 12/31/07 smith ( a o ) corp s&p smallcap 600 index s&p 600 electrical equipment .

a = 142.72 - 100
b = a / 100
c = 210.39 - 100
d = c / 100
e = b - d 
answer = e * 100