1.(a)Louis has ＄200 pocket money every month. If he uses 22.5﹪ of it to buy stationery, how much does he spend on stationery annually?
(b)Louis only spends money on books and stationery, and puts all of the remaining money in the bank. It is known that he uses 40﹪ of pocket money to buy books every month. How much will he have put in the bank after 6 months?
數學題，幫下手
2007-08-29 3:59 am
回答 (5)
2007-08-29 4:09 am
✔ 最佳答案
1(a) $200 x 22.5% x12= $540
(b) ﹝$200 - ($200 x 22.5%) - ($200 x 40%)﹞x 6
= ($200 - $45 - $80) x6
= $450
2007-08-29 4:11 am
1A) $200*22.5%=45
so he spend 45 dollars on stationery
1B) $200*40%=80( he spend on books every month)
$200*6=1200( TOTAL of 6 months pocket money )
(80+45)*6= 750(TOTAL of 6 months he spend on stationery& books)
1200-750=450(ANS of 1B )
so he spend 45 dollars on stationery
1B) $200*40%=80( he spend on books every month)
$200*6=1200( TOTAL of 6 months pocket money )
(80+45)*6= 750(TOTAL of 6 months he spend on stationery& books)
1200-750=450(ANS of 1B )
參考: myself
2007-08-29 4:05 am
1a) The money spent on stationery every month:
$ 200 x 22.5% = $45
Hence the money spent on it annually:
$ 45 x 12 = $ 540
b) The money spent on books every month:
$200 x 40% = $80
The total money he spends every month: $ 80 + $ 45 = $ 125
Then the money he saves per month: $ 200 - $ 125 = $ 75
The amount he has to put after 6 months:
$ 75 x 6 = $ 450
2007-08-28 20:08:29 補充：
Sorry for some typing errors: it should be the amount he has put after 6 months, but not the amount he has to put after 6 months
$ 200 x 22.5% = $45
Hence the money spent on it annually:
$ 45 x 12 = $ 540
b) The money spent on books every month:
$200 x 40% = $80
The total money he spends every month: $ 80 + $ 45 = $ 125
Then the money he saves per month: $ 200 - $ 125 = $ 75
The amount he has to put after 6 months:
$ 75 x 6 = $ 450
2007-08-28 20:08:29 補充：
Sorry for some typing errors: it should be the amount he has put after 6 months, but not the amount he has to put after 6 months
參考: My Maths Knowledge
收錄日期: 2021-04-13 13:10:00
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