42 = 12 420 = 30 4200 = 75
Each multiple of 5 is 2×n×2.5, and each multiple of 25 is 4×n×6.25. 5 = 20 10 = 40 15 = 210 20 = 230 25 = 400 30 = 420 35 = 440 40 = 2110 45 = 2130 50 = 2300 55 = 2320 60 = 2340 65 = 4010 70 = 4030 75 = 4200 80 = 4220 85 = 4240 90 = 4410 95 = 4430 100 = 21 100 Credit to @RodolfoYT12345 for Base 2.5 Band
