what is the roi of an investment in kbw bank index from 2008 to 2011?
shareholder return performance presentation the graph presented below compares the cumulative total shareholder return on state street's common stock to the cumulative total return of the s&p 500 index , the s&p financial index and the kbw bank index over a five- year period . the cumulative total shareholder return assumes the investment of $ 100 in state street common stock and in each index on december 31 , 2008 at the closing price on the last trading day of 2008 , and also assumes reinvestment of common stock dividends . the s&p financial index is a publicly available measure of 81 of the standard & poor's 500 companies , representing 17 diversified financial services companies , 22 insurance companies , 19 real estate companies and 23 banking companies . the kbw bank index seeks to reflect the performance of banks and thrifts that are publicly traded in the u.s. , and is composed of 24 leading national money center and regional banks and thrifts. .

|  | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| State Street Corporation | $100 | $111 | $118 | $105 | $125 | $198 |
| S&P 500 Index | 100 | 126 | 146 | 149 | 172 | 228 |
| S&P Financial Index | 100 | 117 | 132 | 109 | 141 | 191 |
| KBW Bank Index | 100 | 98 | 121 | 93 | 122 | 168 |

.

initial_investment = 100
initial_price = 100
final_price = 93
return_on_investment = final_price - initial_price
answer = return_on_investment / initial_investment * 100