Question

When servicing a heating boiler and radiators, a plumber knows that the time
he will take is given by the formula
Time = 1 hour + 45 minutes per radiator
He charges his customers a call-out fee of £30. plus £20 per hour.
How much should a customer be charged for servicing a heating boiler and
four radiators?

Answer 1

£110 as 45mins times 4 radiators divided by 60 mins =3 hours

3 hours + 1 hour = 4 hours
4 hours times £20= £80
£80+£30=£110

Answer 2

A customer be charged for servicing a heating boiler and four radiator is 110.

What is the unitary method?

The unitary method is a method for solving a problem by the first value of a single unit and then finding the value by multiplying the single value.

When servicing a heating boiler and radiators, a plumber knows that the time he will take is given by the formula

Time = 1 hour + 45 minutes per radiator

He charges his customers a call-out fee of £30 + £20 per hour.

£110 as 45 mins times 4 radiators / 60 mins = 3 hours

3 hours + 1 hour = 4 hours

4 hours times £20= £80

£80 + £30 = £110

Learn more about the unitary method;

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