A shopkeeper earned $504 in 12 days. his average income for the first 4 days was $40 a day. his average income for the remaining days is
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avv of 12 =504/12=42
avg of 4=40
-2 ×4=-8
-8 / 8=-1
42+1=43 is the avg of remaining
avg of 4=40
-2 ×4=-8
-8 / 8=-1
42+1=43 is the avg of remaining
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