WILL MARK U AS BRAINLIEST HELP PLZ

Answer:
84 I think
Step-by-step explanation:
cause 10ft plus 8ft equals 18ft obviously and 18ft x2 for the other side of the 10ft wall equals 36ft and set that aside and we go to the next wall so 16ft plus 8ft equals 24ft and 24ft x2 equals 48ft and then bring back the 36ft from earlier and add it to 48ft so 48ft plus 36ft equals 84ft I'm soooo sorry if it's wrong I tried