Accommodation at school: 6500

Contract term: 5 years

Water price: direct drinking water 0.2 yuan/liter, direct drinking water 0.3 yuan/liter

Calculated at the middle price of 0.25 yuan/liter

According to the normal daily ration of 1.5L/L for each student in school, the highest standard is 0.3yuan/L

Annual income: 6500 * 0.25 * 1.5 * 30 days * 9 months (school time)=658125 yuan

The cost of water and electricity per liter of direct drinking water is about 0.08 yuan

The annual cost is about 210600 yuan

Gross profit of one year is 447525 yuan

Equipment 381575 yuan

The installation cost is calculated based on the cost of 200 sets=200 * 87 sets=17400 yuan

Replacement of filter element: cost of 5 years is about 100 * 87 * 5=43500 yuan

Administrative expenses:

1. Labor, one maintenance, one cleaning: 6000/month * 12=72000 yuan

2. Tax is about 3%, equivalent to about=19743.75 yuan

3. Other expenses

Total for the first year:

Total 447525-381575-17400-43500-72000-19743.75=-86693.75

Including other expenses, between 1.5 and 1.8 years