40*0,995=39,8
39.8*0,995=39.601
39.601*0,995=39.402995
39.402995*0,995=39.205980025
39.205980025*0,995=39.0099501249
39.0099501249*0,995=38.8149003743
38.8149003743*0.995=38.6208258724
math isnt wrong but idk if this is how its done bcs this method looks kinda weird