FIG. 1 is a top plan view of a calculator for a shopping cart showing our new design;

FIG. 2 is a bottom view;

FIG. 3 is a side elevational view of one side and mirror image side elevation view of the other side;

FIG. 4 is a front elevational view and back elevational view; and

FIG. 5 is a perspective view showing the calculator for a shopping cart handle.

The broken line showing of a shopping cart handle and a logo in FIG. 5 is for illustrative purposes only and forms no part of the claimed design.