Our profits differ by just a few commas, which is negligible.

commas 是 comma 的复数形式，comma 本意是"逗号"，在数字中表示小数点后的分隔符，这里指"小数位"。 differ by just a few commas 字面意思是"只相差几个逗号"，引申为"只相差几位小数"的意思。