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(a)
83. + 85 + 80 + 77 + 85 + (0.4 x 5) = 412

(b)
412/10 = 41 (round down to nearest whole number)
41 x 1.20 = 49.20
No, it is not possible as the greatest total mass produced is 412 g which is less than the required 420 g to collect $50 from the sale.

Ans : (a) 412 g; (b) No; as above.

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Thanks for your solution. It would be great to explain about (0.4 x 5).

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Don’t mention. 

From”The daily production, correct to the nearest gram. …”, the greatest possible mass … would be as follows :83.4, 85.4, 80.4, 77.4 and 85.4 for Mon, Tue , Wed, Thu and Fri respectively.  Hence,  plus (0.4 x 5).

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