Answer:
11,000 people
Explanation:
fixed costs per store $80,000
variable cost ratio 0.80
average sale per customer $15
average customer sales per week 1.75
customers as portion of population 4%
each customer shops 1.75 x 52 = 91 times per year
contribution margin per visit = $15 - ($15 x 0.8) = $3
contribution margin per client per year = $3 x 91 = $273
in order to make $40,000 in profits, you need at least:
($80,000 + $40,000) / $273 = 439.56 ≈ 440 customers
to determine the city's total population = 440 / 0.04 = 11,000