Read the following texts and table with financial data from an S&P 500 earnings report carefully.Based on the question-answer history (if provided), answer the last question. The answer may require mathematical calculation based on the data provided.


stock performance graph the following graph sets forth the cumulative total shareholder return on our series a common stock , series b common stock and series c common stock as compared with the cumulative total return of the companies listed in the standard and poor 2019s 500 stock index ( 201cs&p 500 index 201d ) and a peer group of companies comprised of cbs corporation class b common stock , scripps network interactive , inc . ( acquired by the company in march 2018 ) , time warner , inc . ( acquired by at&t inc . in june 2018 ) , twenty-first century fox , inc . class a common stock ( news corporation class a common stock prior to june 2013 ) , viacom , inc . class b common stock and the walt disney company . the graph assumes $ 100 originally invested on december 31 , 2013 in each of our series a common stock , series b common stock and series c common stock , the s&p 500 index , and the stock of our peer group companies , including reinvestment of dividends , for the years ended december 31 , 2014 , 2015 , 2016 , 2017 and 2018 . two peer companies , scripps networks interactive , inc . and time warner , inc. , were acquired in 2018 . the stock performance chart shows the peer group including scripps networks interactive , inc . and time warner , inc . and excluding both acquired companies for the entire five year period . december 31 , december 31 , december 31 , december 31 , december 31 , december 31 . <table class='wikitable'><tr><td>1</td><td>-</td><td>december 312013</td><td>december 312014</td><td>december 312015</td><td>december 312016</td><td>december 312017</td><td>december 312018</td></tr><tr><td>2</td><td>disca</td><td>$ 100.00</td><td>$ 74.58</td><td>$ 57.76</td><td>$ 59.34</td><td>$ 48.45</td><td>$ 53.56</td></tr><tr><td>3</td><td>discb</td><td>$ 100.00</td><td>$ 80.56</td><td>$ 58.82</td><td>$ 63.44</td><td>$ 53.97</td><td>$ 72.90</td></tr><tr><td>4</td><td>disck</td><td>$ 100.00</td><td>$ 80.42</td><td>$ 60.15</td><td>$ 63.87</td><td>$ 50.49</td><td>$ 55.04</td></tr><tr><td>5</td><td>s&p 500</td><td>$ 100.00</td><td>$ 111.39</td><td>$ 110.58</td><td>$ 121.13</td><td>$ 144.65</td><td>$ 135.63</td></tr><tr><td>6</td><td>peer group incl . acquired companies</td><td>$ 100.00</td><td>$ 116.64</td><td>$ 114.02</td><td>$ 127.96</td><td>$ 132.23</td><td>$ 105.80</td></tr><tr><td>7</td><td>peer group ex . acquired companies</td><td>$ 100.00</td><td>$ 113.23</td><td>$ 117.27</td><td>$ 120.58</td><td>$ 127.90</td><td>$ 141.58</td></tr></table> equity compensation plan information information regarding securities authorized for issuance under equity compensation plans will be set forth in our definitive proxy statement for our 2019 annual meeting of stockholders under the caption 201csecurities authorized for issuance under equity compensation plans , 201d which is incorporated herein by reference. .
Question: what is the net change in value of an investment in disca from 2013 to 2018?

-46.44