bonjour,
A) La société a un capital de 300 +500 = 800 euros
part de Pierre = 300/800 = 3/8
part de Paul = 500/800 = 5/8
B) pierre = 4000* 3/8 = 12 000 / 8 = 4*3 *1000 / 4*2 = 3000/2 = 1500
paul = 4000 *5/8 = 20 000 / 8 = 5*4 *1000 / 4*2 = 5000/2 = 2 500