Basic Fire Damage 46-55 (Average 50.5, Round up to 51) Basic Physical Damage 6-7 (Average 6.5, Round up to 7)
Increase from Int = 50% More Fire Damage from Pyro = 15% More phys Damage from Warfare = 30%
Fire portion = 51*1.5*1.15 = 87.975 (Round up to 88) Phys portion = 7*1.5*1.3 = 13.65 (Round up to 14)
Total Average Damage = 102, it is very close to the tooltip (101.5 average).
If Warfare applies to overall Damage, it would be Fire portion = 51*1.5*1.45 = 119.625 (Round up to 120) Phys portion = 7*1.5*1.45 = 15.225 (Round down to 15)
and the total average damage should be closer to 135 instead.