[計量] 請教幾題數學
如題～～請大家幫我一下 謝謝>____<
1.If Stephennie can assemble half the model car in 20 minutes and Dennis can
assemble the model car in 60 minutes, how many minutes will it take them,
working togher, to assemble the model car after Dennis has worked for 15 min.?
2.In an appliance store, all blenders are marked at a discount of 30 percent
off the regular price. At a sale, blender are reduced by 30 percent from the
market price again and sold at further discount of 30 percent. If one
customer purchases a blender for $6.86 at the sale, what is the regular
price before any discount?
3.Mr. Smith can buy a house at the price of $100,000 if he pays cash. Using
an installment plan, he has to pay 25 percent down and pay $8,000
seminannually for 5 years. What is the percent increase between the
installment cost and the cash cost?
4.算到兩題題目都寫到 made a profit of 10 percent of cost
但是有一題解答是寫0.1C 另一題是寫1.1C 這是為什麼阿？？
5.A at 4 percent simple semiannual intrest....
這邊利率不用因為是半年利所以要除以二等於2%嗎？？
拜託大家了 我知道很簡單 但是我太笨了T____T！！！
謝謝～～
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※ 編輯: pringless 來自: 220.134.120.215 (01/31 15:17)
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