Bonsoir,

5/7 + 1/6 =

30/42 + 7/42 =

37/42

Il reste:

42/42 -37/42 = 5/42

5/42  -> 50€

1/42 -> 50/5

30/42 -> (50 *30)/5 => 300€

7/42 -> (50* 7)/5 => 70€

prix:

300+70+50 =>420€