1800:(600-250*2) = 1800:(600-500) = 1800:100 = 18
1400:(800-600)90 = 1400:(200)90 = 1400:18000 = 0.07777777777 or approximately 0.08
1800:(600-250*2)
= 1800:(600-500)
= 1800:100
= 18
1400:(800-600)90
= 1400:(200)90
= 1400:18000
= 0.07777777777 or approximately 0.08