The house Trevor's family lives in has $6$ people (including Trevor) and $3$ bathrooms. In the past month, each person showered for an average of $480$ minutes and used an average of $72$ litres of shower water (over the entire month). Water costs $$0$.$20$\$ per litre. How much money did Trevor's family spend, in total, on shower water in the past month?

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Grade 6

Multiply and divide decimals: word problems

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Q. The house Trevor's family lives in has

6

people (including Trevor) and

3

bathrooms. In the past month, each person showered for an average of

480

minutes and used an average of

72

litres of shower water (over the entire month). Water costs $$0$.$20$\$ per litre. How much money did Trevor's family spend, in total, on shower water in the past month?

Calculate water usage per person: Calculate total water used by one person in a month: $72$ litres.
Calculate total water usage: Calculate total water used by all $6$ people: $72$ litres/person $* 6$ people $= 432$ litres.
Calculate total cost: Calculate total cost of water: $432$ litres $\times $0$.$20$\$ \text{ per litre} = $86$.$4$\$.