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.

Text: mastercard incorporated notes to consolidated financial statements 2014 ( continued ) ( in thousands , except percent and per share data ) 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 11550 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 are expected to be funded 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: . <table class='wikitable'><tr><td>1</td><td>-</td><td>2009</td><td>2008</td><td>2007</td></tr><tr><td>2</td><td>risk-free rate of return</td><td>2.5% ( 2.5 % )</td><td>3.2% ( 3.2 % )</td><td>4.4% ( 4.4 % )</td></tr><tr><td>3</td><td>expected term ( in years )</td><td>6.17</td><td>6.25</td><td>6.25</td></tr><tr><td>4</td><td>expected volatility</td><td>41.7% ( 41.7 % )</td><td>37.9% ( 37.9 % )</td><td>30.9% ( 30.9 % )</td></tr><tr><td>5</td><td>expected dividend yield</td><td>0.4% ( 0.4 % )</td><td>0.3% ( 0.3 % )</td><td>0.6% ( 0.6 % )</td></tr><tr><td>6</td><td>weighted-average fair value per option granted</td><td>$ 71.03</td><td>$ 78.54</td><td>$ 41.03</td></tr></table> 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 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 mastercard . the expected volatility for options granted during 2008 was based on the average of the implied volatility of mastercard and the historical volatility of a group of companies that management believes is generally comparable to mastercard . as the company did not have sufficient publicly traded stock data historically , the expected volatility for options granted during 2007 was primarily based on the average of the historical and implied volatility of a group of companies that management believed was generally comparable to mastercard . the expected dividend yields were based on the company 2019s expected annual dividend rate on the date of grant. .
Question: what is the risk-free rate in 2009?
Answer: 2.5
Question: what about in 2008?
Answer: 3.2
Question: what is the net change?
Answer: -0.7
Question: what percentage change does this represent?
Answer: -0.21875
Question: what is the net change in weighted-average fair value per option granted from 2007 to 2008?

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