table of contents tceq and harris county pollution control services department ( hcpcs ) ( houston terminal ) . we have an outstanding noe from the tceq and an outstanding vn from the hcpcs alleging excess emissions from tank 003 that occurred during hurricane harvey . we are working with the pertinent authorities to resolve these matters . item 4 . mine safety disclosures part ii item 5 . market for registrant 2019s common equity , related stockholder matters and issuer purchases of equity securities our common stock trades on the nyse under the trading symbol 201cvlo . 201d as of january 31 , 2019 , there were 5271 holders of record of our common stock . dividends are considered quarterly by the board of directors , may be paid only when approved by the board , and will depend on our financial condition , results of operations , cash flows , prospects , industry conditions , capital requirements , and other factors and restrictions our board deems relevant . there can be no assurance that we will pay a dividend at the rates we have paid historically , or at all , in the future . the following table discloses purchases of shares of our common stock made by us or on our behalf during the fourth quarter of 2018 . period total number of shares purchased average price paid per share total number of shares not purchased as part of publicly announced plans or programs ( a ) total number of shares purchased as part of publicly announced plans or programs approximate dollar value of shares that may yet be purchased under the plans or programs ( b ) . 
|Period|Total Numberof SharesPurchased|AveragePrice Paidper Share|Total Number ofShares NotPurchased as Part ofPublicly AnnouncedPlans or Programs (a)|Total Number ofShares Purchased asPart of PubliclyAnnounced Plans orPrograms|Approximate DollarValue of Shares thatMay Yet Be PurchasedUnder the Plans orPrograms (b)|
|October 2018|939,957|$87.23|8,826|931,131|$2.7 billion|
|November 2018|3,655,945|$87.39|216,469|3,439,476|$2.4 billion|
|December 2018|3,077,364|$73.43|4,522|3,072,842|$2.2 billion|
|Total|7,673,266|$81.77|229,817|7,443,449|$2.2 billion|
 ( a ) the shares reported in this column represent purchases settled in the fourth quarter of 2018 relating to ( i ) our purchases of shares in open-market transactions to meet our obligations under stock-based compensation plans and ( ii ) our purchases of shares from our employees and non-employee directors in connection with the exercise of stock options , the vesting of restricted stock , and other stock compensation transactions in accordance with the terms of our stock-based compensation plans . ( b ) on january 23 , 2018 , we announced that our board of directors authorized our purchase of up to $ 2.5 billion of our outstanding common stock ( the 2018 program ) , with no expiration date , which was in addition to the remaining amount available under a $ 2.5 billion program authorized on september 21 , 2016 ( the 2016 program ) . during the fourth quarter of 2018 , we completed our purchases under the 2016 program . as of december 31 , 2018 , we had $ 2.2 billion remaining available for purchase under the 2018 program. .


Question: as of december 2018 what was the percent of the 2018 program still outstanding (in percentage)

Solution:
def solution():
    # Define variables name and value
    outstanding_amount = 2.2
    total_authorized = 2.5
    
    # Do math calculation to get the answer
    answer = (outstanding_amount / total_authorized) * 100
    
    return answer

Answer: 88.00000000000001