Cost of Natural Gas In April, 2012, Nicor Gas had the following rate schedule for natural gas usage in single-family...

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 Cost of Natural Gas In April, 2012, Nicor Gas had the following rate schedule for natural gas usage in single-family residences: 

Monthly customer charge: $8.40 

Distribution charge: 
1st 20 therms: $0.1473/therm 
Next 30 therms: $0.0578/therm 
Over 50 therms: $0.0519/therm 

Gas supply charge: $0.43/therm 

(a) What is the charge for using 40 therms in a month? 
(b) What is the charge for using 150 therms in a month?

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