mastercard incorporated notes to consolidated financial statements 2014continued in september 2010 , the company 2019s board of directors authorized a plan for the company to repurchase up to $ 1 billion of its class a common stock in open market transactions .
the company did not repurchase any shares under this plan during 2010 .
as of february 16 , 2011 , the company had completed the repurchase of approximately 0.3 million shares of its class a common stock at a cost of approximately $ 75 million .
note 18 .
share based payment and other benefits in may 2006 , the company implemented the mastercard incorporated 2006 long-term incentive plan , which was amended and restated as of october 13 , 2008 ( the 201cltip 201d ) .
the ltip is a shareholder-approved omnibus plan that permits the grant of various types of equity awards to employees .
the company has granted restricted stock units ( 201crsus 201d ) , non-qualified stock options ( 201coptions 201d ) and performance stock units ( 201cpsus 201d ) under the ltip .
the rsus generally vest after three to four years .
the options , which expire ten years from the date of grant , generally vest ratably over four years from the date of grant .
the psus generally vest after three years .
additionally , the company made a one-time grant to all non-executive management employees upon the ipo for a total of approximately 440 thousand rsus ( the 201cfounders 2019 grant 201d ) .
the founders 2019 grant rsus vested three years from the date of grant .
the company uses the straight-line method of attribution for expensing equity awards .
compensation expense is recorded net of estimated forfeitures .
estimates are adjusted as appropriate .
upon termination of employment , excluding retirement , all of a participant 2019s unvested awards are forfeited .
however , when a participant terminates employment due to retirement , the participant generally retains all of their awards without providing additional service to the company .
eligible retirement is dependent upon age and years of service , as follows : age 55 with ten years of service , age 60 with five years of service and age 65 with two years of service .
compensation expense is recognized over the shorter of the vesting periods stated in the ltip , or the date the individual becomes eligible to retire .
there are 11550000 shares of class a common stock reserved for equity awards under the ltip .
although the ltip permits the issuance of shares of class b common stock , no such shares have been reserved for issuance .
shares issued as a result of option exercises and the conversions of rsus and psus are expected to be funded primarily with the issuance of new shares of class a common stock .
stock options the fair value of each option is estimated on the date of grant using a black-scholes option pricing model .
the following table presents the weighted-average assumptions used in the valuation and the resulting weighted- average fair value per option granted for the years ended december 31: .

2010
2009
2008
Risk-free rate of return
2.7%
2.5%
3.2%
Expected term (in years)
6.25
6.17
6.25
Expected volatility
32.7%
41.7%
37.9%
Expected dividend yield
0.3%
0.4%
0.3%
Weighted-average fair value per option granted
$84.62
$71.03
$78.54

the risk-free rate of return was based on the u.s .
treasury yield curve in effect on the date of grant .
the company utilizes the simplified method for calculating the expected term of the option based on the vesting terms and the contractual life of the option .
the expected volatility for options granted during 2010 and 2009 was based on the average of the implied volatility of mastercard and a blend of the historical volatility of mastercard and the historical volatility of a group of companies that management believes is generally comparable to .

Question: Analyse this data from a financial earnings document. what was the percentage change in the risk-free rate of return from 2009 to 2010
Choices:
0.2
-0.6
-0.08
0.08
1
Correct choice index: 3