They are infinite but here are the first 10: 2400, 4800, 7200, 9600, 12000, 14400, 16800, 19200, 21600, 24000.
multiples of 400: 400, 800, 1200, 1600, 2000, 2400, ...
800, 1600, 2400, 3200, 4000, 4800, 5600, . . .
The first 15 multiples of 160: 160, 320, 480, 640, 800, 960, 1120, 1280, 1440, 1600, 1760, 1920, 2080, 2240, 2400 . . . ∞
2700-2400/2400= 300/2400=.125 12.5%
75% of 2,400= 75% * 2400= 0.75 * 2400= 1,800
multiples of 400: 400, 800, 1200, 1600, 2000, 2400, ...
3x280+380+450+(365x2)=2400
800, 1600, 2400, 3200, 4000, 4800, 5600, . . .
24, 240 and 2400
400, 800, 1200, 1600, 2000, 2400, 2800, 3200 +400 . . .
The first 15 multiples of 160: 160, 320, 480, 640, 800, 960, 1120, 1280, 1440, 1600, 1760, 1920, 2080, 2240, 2400 . . . ∞
The first 15 multiples of 1200: 1200, 2400, 3600, 4800, 6000, 7200, 8400, 9600, 10800, 12000, 13200, 14400, 15600, 16800, 18000 . . .
300, 600, 900, 1200, 1500, 1800, 2100, 2400, 2700, 3000.
No, 1900 is not a multiple of 400. The multiples of 400 are 400, 800, 1200, 1600, 2000, 2400, ...
600, 1200, 1800, 2400, 3000, 3600, 4200, 4800, 5400, 6000.
800, 1600, 2400, 3200, 4000, 4800, 5600, 6400, 7200, 8000, 8800, 9600, 10400, . . .
480, 960, 1440, 1920, 2400, 2880, 3360, 3840, 4320, 4800, 5280, . . .