p.66
9. The marked price of a battery of certain brand is $6. One can buy an economic pack of 8 batteries for $36. In a sale, one can get 4 free batteries if he buys two economic packs. What is the actual discount per cent if he buys two economic packs of batteries?
10. The marked price of a plasma TV is $3200. It is sold at a 27% discount.
(a) Find the selling price a profit of plasma TV.
(b) Find the cost price of the plasma TV.
(c) If the cost price is increased by $2 000 and the marked price remains unchanged, find the new discount % such that the profit per cent remains unchanged.
幚我做幾條數(20分)
2008-12-30 12:44 am
回答 (2)
2008-12-30 2:09 am
✔ 最佳答案
__9__The selling price of 2 economic packs of batteries= 36 x 2
=($) 72
__The marked price of 2 economic packs of batteries
= 6 x ( 8 + 8 + 4 )
= ($) 120
__The discount per cent
= (120 - 72) / 120 x 100%
= 40 %
__10__第10條資料唔齊全 , 無法計算 , 還有10 a) 問題有錯漏
先幫你解答第9條 , 有機再幫你答番第10條啦= =
參考: 自己-_-
2008-12-30 12:58 am
9/ If he buys two economic packs of batteries, the total price is $36 X 2 = $72
Total number of batteries he gets: 8 + 8 + 4(free) = 20
If he buys 20 batteries at marked price of $6, total price will be: $6 X 20 = $120
So the discount will be 100% - $72/$120 X 100% = 40% discount
10/ I guess some information is missing here. Please check the questions again.
Total number of batteries he gets: 8 + 8 + 4(free) = 20
If he buys 20 batteries at marked price of $6, total price will be: $6 X 20 = $120
So the discount will be 100% - $72/$120 X 100% = 40% discount
10/ I guess some information is missing here. Please check the questions again.
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