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profit and loss

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profit and loss
a computer game software marked at $280 is sold at 20% off.If the discount is 35% of its cost price,find the profit per cent.
A cat and a dog are not satisfied with their weights.If the weight of the cat is increased by 20% while that of the dog is decreased by 10%,their weights will be the same.what percentage of the dog's original weight is the cat's orignal weight?
(1)280打折去掉20%,等于280*0.2=56,是成本价的35%,成本价为56/0.35=160,利润为120,利润率为120/280=42.86%
(2)猫重x,狗重y,x(1+0.2)=y(1-0.1),y/x=1.2/0.9=133.33%
比较详细了,哪里不明白可以继续问我~