LETTER AGREEMENT

Exhibit (d) 3.20

LETTER AGREEMENT

State Street Bank and Trust Company

X.X. Xxx 0000

Xxxxxx, XX 00000

Re: Yield Calculation Services Agreement

Pursuant to Section 9 of the Amended and Restated Yield Calculation Services Agreement of Xxxxxxx Investment Company (“RIC”), dated August 1, 2006, RIC advises you that it is creating Class A Shares, Class C Shares and Class S Shares for the existing Equity I, Equity Q, Equity II, International and Fixed Income III Funds (the “New Classes”). RIC desires for State Street Bank and Trust Company to compute the performance results of the New Classes pursuant to the terms and conditions of the Amended and Restated Yield Calculation Service Agreement. The fees to be charged by you in return for your services are set forth in the Amended and Restated Yield Calculation Services Agreement.

Please indicate your acceptance to amend the Amended and Restated Yield Calculation Service Agreement by executing this letter agreement and returning it to the undersigned.

Sincerely,

XXXXXXX INVESTMENT COMPANY

By:

Xxxx X. Xxxxxxx

Treasurer

Accepted this              day of                                         , 0000

XXXXX XXXXXX BANK AND TRUST COMPANY

By:

Its: