There are many different types of idiopathic headache with the pain in the back of the head, including epicrania fugax, nummular headache, cluster headache, and hemicrania continua. There is also a condition termed new daily persistent headache, which also belongs to this type and can cause a headache for several months.
Calculate Use: Multiply the number of pages per week (the average in a production environment is 100) by the number of weeks in a six-month period (26). A good estimate is that you will print 2,600 pages each six months. Now, take 2,600 and divide it by the number of pages the ink cartridge will print (225).
We bought into the HP lowest tier Instant Ink program, which was $2.99 a month. That's $36 (plus tax) a year for UP TO 50 pages a month, plus any unused pages from previous months, (up to another 50 pages a month, if you have that many currently unused.)