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Help with percentages

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Since A has already spent all the money needed their final amount will remain $860(Put $ in front of the number). We know that 860 has to be 80% of the actual end total. ie .80 * total = 860 we can divide .80 from both sides and get that the total = 1075. Subtract the money already spent and $1075 - $1010 = $65, gives you the additional money that B must spend to be 20% of the total
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Just make 860 into 80% of the total, instead of 85.1%. So 20% would be 215, and B has to spend $65 more now.

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