For payments that are created at intervals greater than month to month divide via the number of months in the interval (eg. for electricity bills that come each individual quarter, divide the quantity compensated last quarter by three to get the Average monthly.) As far as "per X" goes, https://financefeeds.com/btc-news-bitcoin-solaris-launches-revolutionary-mobile-mining-app-that-could-turn-100-into-a-fortune/