15% × 39 =
(15 : 100) × 39 =
(15 × 39) : 100 =
585 : 100 =
5,85;
% × 1.000 =
(40 : 100) × 1.000 =
(40 × 1.000) : 100 =
40.000 : 100 =
400;
2,1% × 400 =
(2,1 : 100) × 400 =
(2,1 × 400) : 100 =
840 : 100 =
8,4;
145% × 900 =
(145 : 100) × 900 =
(145 × 900) : 100 =
130.500 : 100 =
1.305;