At this rate of expenses and revenue after one week, the savings will last for 35 weeks.
Expenses and Revenue after one week:
Items Expenses Revenue
Cleaning Chemicals $31
Brushes and Towels $17
Transportation $10
Income ($15 per pool) $30
Flyers for Advertising $12
Fixed cost (Flyers) = $12
Variable costs = $58 ($31 + $17 + $10)
Contribution margin per week = -$28 ($30 - $58)
Capital (savings) = $1,000
The number of weeks the savings will last = ($1,000 - $12) ÷ $28 = 35.3 weeks
Thus, the savings will last approximately 35 weeks.