business q

[studyhound]

can someone show me how to do this q:

In January, the air fare to Darwin was a certain price.  As a result of demand and fuel costs, the prices of the air fare in the following months of February to May fluctuated as shown below:

February   -   January’s price of air fare is increased by 10%    
March      -   February’s price is reduced by 10%
April      -   March’s price is increased by 5%
May      -   April’s price is reduced by 5%

When compared with January’s price, the price of the air fare in May was

A.   1.2475% higher than January’s price

B.   1.2475% lower than January’s price

C.   7.5% higher than January’s price

D.   7.5% lower than January’s price

E.   the same as that in January



cheers

[mtwtfss]

B i'm prets sure.

Jan = $100
Feb = +10% = $110
March = -10% = 99
April = +5% = 103.95
May= -5% = 98.755

[studyhound]

ta, on more i cnt do

Jane has calculated that she needs $2 200 per month for living expenses.  The amount, to the nearest dollar, that she will need to invest at 6.75% per annum interest to provide for her monthly living expenses for an indefinite period is

A.   $32 593

B.   $289 104

C.   $137 398

D.   $391 111

E.   $365 652

[TrueTears]

2200 per month implies dollars per year.

She needs to be able to pay off that much amount of money per year for her living expenses.

so for an indefinite period (assuming yearly), let x be the amount she has to invest per year:



Hence D