Условие:

84 * 1040;
78 * 10700;
10 * (92020);
8 * (720700);
184 * 100300;
100 * 3913000.

84 * 1040 = 84040 = 800;
78 * 10700 = 780700 = 80;
10 * (92020) = 10 * 900 = 9000;
8 * (720700) = 8 * 20 = 160;
184 * 100300 = 18400300 = 18100;
100 * 3913000 = 391003000 = 36100.