US population= 320 million
1. Assuming the population is evenly distributed between the age groups of 0-80. Discounting infants aged 0-5:
age 5-10: 20 M;
20-30: 40M (20M Men; 20M Women);
30-40 : 40M (20M Men; 20M Women);
40-50 : 40M (20M Men; 20M Women);
50-60 : 40M (20M Men; 20M Women);
60-70 : 40M (20M Men; 20M Women);
70-80 : 40M (20M Men; 20M Women);
2. Assuming that population ages 5-20 yrs goes to the salon once every month-male and female alike.
3. Assuming that in the population aged 20-80; 80% men use the salon, and 90% women use the salon. The rest go for DIY or are bald or need less haircare. Also, salon customers in this group uses the salon once a month. Assuming, a typical men's service takes half an hour and women's service takes one hour.
Thus total service hours required would be: 60M*.5+120M*0.8*0.5+120M*0.9*1.5= 240M hrs. per month
4. Now, assuming salons are basically of two types- boutique (3 service areas per salon-80% of market) or Large (6 service areas per salon-20% of market)- and are open 6 days a week for 12 hours per day.
Thus, number of boutique salons= (270M*.8)/(3*6*12)=1M
& number of large salons= (270M*.2)/(6*6*12)=.125M
Thus, total number of salons would be about 1.125M.