Answer these

\fProviding restrooms at parks, zoos, and other city- owned recreation facilities is a considerable ex- pense for municipal governments. City councils usually opt for permanent restrooms in larger parks and portable re smaller ones. The cost of renting and servicing a portable restroom 15 57300 per year. In one northeastern municipal- ity, the parks director informed th that the cost of constru restroom is $218,000 and the is $12,000. He remarked that the rather high cost is due to the necessity to use c e materials that are tailored to minimize damage from vandalism that often oc- curs in unattended public facilities. If the useful life of a permanent restroom is assumed to be 20 years, how many portable restrooms could the city afford to rent each year and break even with the cost of one permanent facility? Let the interest rate be 6% per year.\f\f\f\f