on part de a :
+30% = a + 30% x a = 1,30 a
+30% = 1,30a + 30% x 1,30a = 1,69 a
+30% = 1,69a + 30%x1,69a = 2,197a
donc b/a = 2,197
:)
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on part de a :
+30% = a + 30% x a = 1,30 a
+30% = 1,30a + 30% x 1,30a = 1,69 a
+30% = 1,69a + 30%x1,69a = 2,197a
donc b/a = 2,197
:)