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A. 7
B. 14
C. 21
D. 28
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14
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a/g
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2.01%
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6
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10, 25, 45, 54, 60, 75, 80
10, 25, 45, 54, 60, 75, 80
A. 75
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C. 45
D. 10
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54
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99/1020
Initially (2*33 + 1*24)/(2+1) = 30p a gm
So, cost for 100g = 100*30 = 3000p
Later, (1*33 + 2*24)/(1+2) = 71/3 p a gm.
So, cost for 100g = 100*(71/3) = 2366.67p
He saves 3000 – 2366.67 = 633.33p
Concept of weighted average.