FIG. 1 is a top front perspective view of a memo calculator;

FIG. 2 is a front elevation view of the memo calculator of FIG. 1;

FIG. 3 is a left side elevation view of the memo calculator of FIG. 1;

FIG. 4 is a bottom plan view of the memo calculator of FIG. 1;

FIG. 5 is a top plan view of the memo calculator of FIG. 1;

FIG. 6 is a back side elevation view of the memo calculator of FIG. 1; and,

FIG. 7 is a top front perspective view of an alternate position of the memo calculator of FIG. 1.

The broken line showing is for illustrative purposes only and forms no part of the claimed design.