『百分率的應用』唔該你地.幫幫忙呀.唔該晒你

1. 沙甸魚每罐價
= 17.25 / (1+15%)
= $15

2. 姊姊有
=125 X 120%
= $150

3. 這本故事原有
= 25 / (1- 40% - 50%)
= 250 (頁)

4. 洗衣機原價
= 3570 / ( 1- 15%)
= $ 4200

5. 未加薪前的薪金
= 13125 / ( 1+ 5%)
=$12500

6. 陳伯伯今年的薪金
= (28000 X 1+25%) X (1- 25%)
= $26250

希望可選我為最佳解答, 多謝!

1. 17.25 / (1+15%) = 17.25 / 1.15 = $15

2. 125 x (1+20%) = 125 x 1.2 = $150

3. 25 / (1 - 40% - 50%) = 25 / 10% = 250

4. 3570 / (1 - 15%) = $4200

5. 13125 / (1+5%) = 13125 / 1.05 = 12500

6. 28000 x (1+25%) x (1-25%) = 26250

1. 沙甸魚每罐售價
=17.25×(1-15%)
=17.25×0.85
=$14.6625
=$14.66 (四捨五入)

2. 姊姊有
= 125×(1+20%)
= 125×1.2
= $150

4. 洗衣機原價為
=3570 ÷ (1-15%)
=3570 ÷ 0.85
=$4200

5. 未加薪前的薪金為
=13125 ÷ (1+5%)
=13125 ÷ 1.05
=$12500

6. 陳伯伯今年的薪金為
=28000×(1+25%)×(1-25%)
=28000×1.25×0.75
=35000×0.75
=$26250

第3題唔識@@

2011-08-19 15:51:17 補充：
第1題答案
=$14.66 (四捨五入) 應該係 (取至小數點後2個位)

2011-08-20 16:15:30 補充：
3. 故事書原有=25 / (1-40%-50%)
=25 / 0.1
=250頁