中一數學問題一條 (5分)

2007-01-15 3:06 am
A將每月收入既15%儲蓄起來,如果佢每月既支出都係$6800,問佢一年既收入

已知答案係$96000
童埋每月既收入係$8000

條式係點呢


唔該

回答 (4)

2007-01-15 8:05 am
✔ 最佳答案
A將每月收入既15%儲蓄起來,
1-15%=85%
就是說佢每月支出85%,
6800除以85%=8000$
SO 8000$是童埋每月既收入
8000X12=96000
SO 96000是童埋一年既收入
參考: ME
2007-01-15 10:42 pm
Let say Y=monthly income

Y-6800=Y x 15%
Y-6800=0.15Y
0.85Y=6800
Y=8000

Total Yearly income = 12Y = HK$96,000
2007-01-15 3:12 am
每月收入 - A

(A - A x 0.15) = 6800
0.85A=6800
A= 6800 / 0.85
A=8000

每月收入 = 8000
一年既收入= 8000 x 12 = 96000
2007-01-15 3:11 am
每月既收入 = $6800 / ( 1 - 15% )
= $8000
一年既收入 = $8000 * 12
= $96000
P.S. / = 除, * = 乘


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