In a certain compound house, there lives 3 households with 7 people living all together in the house. There arose a misunderstanding amongst them on how much each individual is to pay as water bill for the month because some people spend just a few days in the house due to the nature of their jobs. The amount in dispute as water bill is GHC 305. Derive a formula to help the tenants permanently. (Remember that majority of the occupants are inclined towards a daily payment).​