Tarifing or Tariffing: How To spell?

The word Tarifing is misspelled against Tariffing, which is present continuous of "Tariff"

Tariffing has double "ff" is mispronounced as "f"
Remember double 'FF' in between the strings Tari & ing which should not be misspelled with single 'F'
Wrong Spelling: Tari-f-ing
Correct Spelling: Tari-ff-ing
Find more wrongly spelled words of Tariffing to spell it well.