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A person is given n rupees weekly for every 3 dozen of bread he makes and m rupees for every extra dozen. During a month, he made 4 dozen of bread in the first week, 9 dozen in the 2nd week, 13 dozen in 3rd week and 16 dozen in the 4th week. What was his average earning of the week?

A person is given n rupees weekly for every 3 dozen of bread he makes and m rupees for every extra dozen. During a month, he made 4 dozen of bread in the first week, 9 dozen in the 2nd week, 13 dozen in 3rd week and 16 dozen in the 4th week. What was his average earning of the week? Correct Answer (13n + 3m)/4

According to the question:

⇒ 1st week salary = n + m

⇒ 2nd week salary = 3n

⇒ 3rd week salary = 4n + m

⇒ 4th week salary = 5n + m

⇒ Total earnings = 13n + 3m

∴ Average = (13n + 3m)/4

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