How much do you deliberate?

How much do you think an 18 year old should get compensated to watch a 11 or 12 year old and a 7 or 8 year old boys from 9 am - 4:30 pm for 5 days? How much would you charge/ pay/ or focus should be reasonable. Specific answers to a range is what i am looking for but not general or broad ranges please. (Not Including prices for trips and things to do next to them but keeping in mind everyday would include something to do not at their home) 10 pts. to best answer!! (Also posted in Family cause I be not sure where to put it)
If you have taken courses on childcare and central health care(like CPR) you can charge more. I watched two toddlers from 6 to 5 4 days a week and got 200 a week
that's 7.5 hours a day for 5 days and 2 kids newly 5(lb$?) per hour is 375.
but they wouldn't pay that - would they?
dont charge per kid.

37.5 hours at 5 per hour is 187.5

and what are they doing not at school?
Answers:    In my country, looking after 2 kids for 5 days base on a monthly charge of S$800 per kid i.e $1600 divide by 4 weeks = $400.
between 10-50 dollars, depending on the family's wealthiness

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