This would be £42 million...current sum we paid for Martial is £44 or so (with the goal he scored on weekend to activate that 10 million euros clause). Martial could reach 10 million euros more if he gets shortlisted for ballon d'or. So in general it's similar sums...
To add, if we get him I find it less likely we'll go for Griezmann...I would be all up for getting Bernardo though if it means we will go for one more attacker. Only 22, 4 years younger than Griezmann and cheaper. He would add that penetration and creativity we missed from the right side or as #10...would be immense.