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bigdecimal_precision

🧮 Accurate Decimal with BigDecimal​

Use BigDecimal for financial or scientific calculations where floating‑point errors are unacceptable. Always require 'bigdecimal' (and 'bigdecimal/util' for String conversions).

require 'bigdecimal'
require 'bigdecimal/util'

price = '19.99'.to_d
tax_rate = '0.075'.to_d

total = price + (price * tax_rate)
puts total.to_s('F')
# => "21.48825"