Marcia Curtis is the Vice President of Development for "Tamales to Go$"$ a

rapidly expanding chain of restaurants featuring takeout tamales and other

Mexican food specialties. Currently, the chain has $150$ units and average

unit volume is $$850,000$ per year. Annual per$-$unit revenue growth for

opened units is $5$ percent per year.

Tonya Gamez, the chain's president, has promised company stockholders

that the chain will experience $12$ percent overall revenue growth in the next

year. Assuming that per$-$unit growth on existing units continues to average

$5$ percent, calculate how many total operating units Marcia will need to

have open next year to meet Tonya's goal of a $12$ percent overall increase

in the chain's revenue.