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新紀元數學 1a 答案(20)

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新紀元數學 1a 答案 3c (12-22) pls!~ 急

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12 Shirley's profit per cent=(280-200)/200 x100%=45% William's profit per cent=(87-60)/60 x100%=40% William's profit per cent is greater. 13 (15x16-200)/200 x100%=20% 14 Kelvin's loss per cent=(350-280)/350 x 100%=20% Jenny's loss per cent=(450-369)/450 x 100%=18% Jenny's loss per cent is smaller. 15 (480-3.5x12x10)/480 x100%=12.5% 16(a) (a)200000 x 7/8=175000 (b) (200000-175000)/200000 x100% =12.5% 17 Let the cost price of each toy car is $x. x(40%)=2800000/20000 x=350 18 6除(1+20%) x (1+10%)=$5.5 19 Let the profit per cent is x. profit=230除(1+15%)=200 The profit per cent if it was sold at $250: (250-200)/200 x100%=25% 20 (2700+300)x(1+20%)=$3600 21(a) Let the profit per cent is x. profit=7760除(1-3%)=$8000 The loss per cent if it was sold at $7440: (8000-7440)/8000 x100%=7.5% (b) 8000x(1+10%)=$8800 22 {[500 x (1-30%) +750 x (1+24%) -(500+750)] / (500+750)} x100% =2.4%

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