Bonjour;
1)
6,8*10 000 000
= 68 000 000 cm => 680km
2)
3/5*100
=> 60%
3)
1kg = 1 000g
1 000g -> 18€
1g -> 18 /1 000
100g -> (18*100)/1 000
=> 1,80€
100g -> 1,80€
300g -> 1,80*3
=> 5,40€
5,40 > 4,50
donc impossible
