Common use of Form of Amendment No Clause in Contracts

Form of Amendment No. 6 to the Master Distribution and Individual Shareholder Services Plan (A Class), dated March 31, 2006 (filed as Exhibit 10(aa) to Post-Effective Amendment No. 1 to the Registration Statement on Form N-14 of American Century Mutual Funds, Inc. on January 27, 2006, File No. 2-14213, and incorporated herein by reference).

Form of Amendment No. 6 to the Master Distribution and Individual Shareholder Services Plan (A B Class), dated March 31, 2006 (filed as Exhibit 10(aa10(hh) to Post-Effective Amendment No. 1 to the Registration Statement on Form N-14 of American Century Mutual Funds, Inc. on January 27, 2006, File No. 2-14213, and incorporated herein by reference).

Form of Amendment No. 6 9 to the Master Distribution and Individual Shareholder Services Plan (A C Class), dated March 31, 2006 (filed as Exhibit 10(aa10(r) to Post-Effective Amendment No. 1 to the Registration Statement on Form N-14 of American Century Mutual Funds, Inc. Investment Trust on January 27, 2006, File No. 233-1421365170, and incorporated herein by reference).