1.The marked price of a watch is $300, the profit will be $180. If this watch is sold at a discount of 30%, find the profit.
答案係:The profit = $90.
2.The marked price of a table is $520. If the table is soldat a discount of 25%, the profit will be $65. Find the cost price.
答案係:The cost price = $325
How much water must be added to 200cm3 of a liquid which contains 80% alcohol, to obtain a liquid which contains 20% alcohol?
答案係:600cm3
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2007-02-05 4:13 am
回答 (3)
2007-02-05 4:41 am
✔ 最佳答案
marked price $300 - profit $180 = cost $120marked price $300 x discounted to 70% = discounted price $210
discounted price $210 - cost $120 = profit $90
marked price $520 x discounted to 75% = cost + profit $65
so discounted price is $390, minus $65 profit gives cost price $325
200cm3 liquid contains 80% alcohol, so contains 200 x 80% = 160cm3 alcohol
for TOTAL liquid contain 20% alcohol, 160 / 20% = 800cm3
so 200cm3 + 600cm3 (added water) = 800cm3
2007-02-05 4:29 am
1. 300X(1-30%)- (300-180)
=90
2. 520X (1-25%) - 65
=325
3. 200X80%/20% - 200
=600
=90
2. 520X (1-25%) - 65
=325
3. 200X80%/20% - 200
=600
2007-02-05 4:28 am
1 300 x (1 - 30%) - ( 300 - 180 ) = 90
2 520 x (1 -25% ) - 65 = 325
3 ( 200x 80% ) / ( 20% ) - 200 = 600
2 520 x (1 -25% ) - 65 = 325
3 ( 200x 80% ) / ( 20% ) - 200 = 600
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