69420
780 x 0.6213 = 484.614
13 x 60 = 780
22 x 3 x 5 x 13 = 780
780 = 22 x 3 x 5 x 13
780 x 0.175 = 136.5
% rate:= 780 x 100%= 78000%
780 x 0.65 = 507
7.8 is 1% of 780 and 7.8 x 56 = 56% of 780, which is 436.8
52 x 15 = 780
89+x=x 89=x-x 89=0 Therefore, "No solution".
780 x 60 = 46800
780