for the fourth quarter of 2017 what was the percent of the total number of shares attested to upc by employees to pay stock option exercise prices
five-year performance comparison 2013 the following graph provides an indicator of cumulative total shareholder returns for the corporation as compared to the peer group index ( described above ) , the dj trans , and the s&p 500 . the graph assumes that $ 100 was invested in the common stock of union pacific corporation and each index on december 31 , 2012 and that all dividends were reinvested . the information below is historical in nature and is not necessarily indicative of future performance . purchases of equity securities 2013 during 2017 , we repurchased 37122405 shares of our common stock at an average price of $ 110.50 . the following table presents common stock repurchases during each month for the fourth quarter of 2017 : period total number of shares purchased [a] average price paid per share total number of shares purchased as part of a publicly announced plan or program [b] maximum number of shares remaining under the plan or program [b] .

| Period | Total Number of Shares Purchased [a] | Average Price Paid Per Share | Total Number of Shares Purchased as Part of a Publicly AnnouncedPlan or Program [b] | Maximum Number of Shares Remaining Under the Plan or Program [b] |
| :--- | :--- | :--- | :--- | :--- |
| Oct. 1 through Oct. 31 | 3,831,636 | $113.61 | 3,800,000 | 89,078,662 |
| Nov. 1 through Nov. 30 | 3,005,225 | 117.07 | 2,937,410 | 86,141,252 |
| Dec. 1 through Dec. 31 | 2,718,319 | 130.76 | 2,494,100 | 83,647,152 |
| Total | 9,555,180 | $119.58 | 9,231,510 | N/A |

[a] total number of shares purchased during the quarter includes approximately 323670 shares delivered or attested to upc by employees to pay stock option exercise prices , satisfy excess tax withholding obligations for stock option exercises or vesting of retention units , and pay withholding obligations for vesting of retention shares . [b] effective january 1 , 2017 , our board of directors authorized the repurchase of up to 120 million shares of our common stock by december 31 , 2020 . these repurchases may be made on the open market or through other transactions . our management has sole discretion with respect to determining the timing and amount of these transactions. .

shares_attested = 323670
shares_total = 9555180
percent_attested = shares_attested / shares_total
answer = percent_attested * 100