400 -100%
х-75 % (100%-25%)
(400×75):100= 300
400 - 100%
х- 60% (100%-40%)
(400×60):100=240
40-100%
х-50% (100%-50%)
(400×50):100=200 или 400:2=200
400 -100%
х-75 % (100%-25%)
(400×75):100= 300
400 - 100%
х- 60% (100%-40%)
(400×60):100=240
40-100%
х-50% (100%-50%)
(400×50):100=200 или 400:2=200