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2015-02-20T17:57:38+08:00

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Arithmetic series formula is
1/2(n)(a1+an) the n is 8, and the sum is already given which is 480

Substitute
480=\frac{1}{2}(8)(10+a8)
Divide both sies by 1/2
960=80+8a8
Subtract 80 to both sides
880=8a8
Divide both sides by 8
a=110

The leader will get $110. Hope this helps =)
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