require 'bigdecimal'
a = BigDecimal.new("1.2")
b = BigDecimal.new("1.0")
c = BigDecimal.new("0.2")
puts a - b == c
puts a * 10 - b * 10 == c * 10
cmVxdWlyZSAnYmlnZGVjaW1hbCcKIAphID0gQmlnRGVjaW1hbC5uZXcoIjEuMiIpCmIgPSBCaWdEZWNpbWFsLm5ldygiMS4wIikKYyA9IEJpZ0RlY2ltYWwubmV3KCIwLjIiKQogCnB1dHMgYSAtIGIgPT0gYwpwdXRzIGEgKiAxMCAtIGIgKiAxMCA9PSBjICogMTA=