Mafi is a Goroshevkan curency named after the dangerous Golgashian cave "Mafia" demolised in 1982 (or at least that's what the general public thinks). One Mafi costs 3.42 USD (e.x. if you want to buy an old computer including a mouse, a monitor, a keyboard, a hard drive, and the operating system disk with GBS System 7.0, it whould cost around 1315M and 79N,)
There is also the cents of mafi, however they do not have an offical name but do have an offical symbol