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標題:

maths !!!!!!!!!!!!!!!!!!!!!!S.1

發問:

1.If the mothly salary of Mr.Chan is 25% higer than that of Mr .lee,then the monthly salary of MR .lee is lower than of Mr.Chan by? 2.th expenditure of johnly is 70% of his income.the rest ofhis salary is for saving.If the expenditure is $8 400, find the mount of the saving

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最佳解答:

Question 2. Let amount of saving =S Let income = I and Let Expenditure = E Therefore, (1) E = I - S (2) E = 70%I, that is I = E/0.7 , substitute this result into (1), we get E = E/0.7 - S or S = E/0.7 - E = E(1/0.7 - 1) = E(1 - 0.7)/0.7 = E(0.3)/0.7 = 3E/7. Now E = 8,400, therefore, S = 8,400 x 3/7 = 3,600 Amount of saving is $3,600.

其他解答:

1 Let Mr.Lee's salaries be a Then Mr.Cahn's salaries is 1.25a Mr.Lee's salries i lower than Mr.Chan's by (1.25a-a)/1.25a*100% =20% 2 8400/70% =120000D7DAC4E7B8CAAC5