A dozer equipped with a three$-$shank ripper will be used in a loading and ripping application. Actual ripping will take place only about $20\%$ of the total dozer operating time. A ripper shank consists of the shank itself, a ripper tip, and a shank protector. The estimated operating life for the ripper tip is $30$ hours. The estimated operating life of the ripper shank protector is $3\backslash$times tip life.

The local price for a tip is $$70$ and $$126$ for shank protectors. What hourly high$-$wear$-$item charge should be added to the operating cost of the dozer in this application?