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chen donates 15% of his current salary to charity. if his pay is increased by 10% and he still donates 15% of his salary by what % do his charity contributions increase?

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a uniform circular coin required too much metal relative to its value.. it is decided that the diameter of the coin can be reduced by 10% by how much will weight of the coin reduce if everything else about the coin remains unchanged. john weighs twice as much as maria. maria's weight is 60% of bob's weight .dave's weight is 50% of lee's weight. lee's weighs 190% of john's weight.which of these weight the least?