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September 16, 2014

September 16, 2014

Posted by **liz c** on Saturday, November 13, 2010 at 9:46pm.

$ 1

- math -
**Reiny**, Saturday, November 13, 2010 at 9:53pmThe instructions in your questions tell you how to do it.

Give it a try.

- math -
**liz c**, Saturday, November 13, 2010 at 10:16pmfirst part?1276.9

- math -
**liz c**, Saturday, November 13, 2010 at 10:18pmfinal answer?1225.82?

- math -
**Reiny**, Saturday, November 13, 2010 at 10:28pmfirst part:

1000(1.13)^2 = 1276.90

You are right.

Second part:

1276.90(.98)^2 = 1226.33

One step calculation:

1000(.98)^2(1.13)^2 = 12236.33

How did you get 1225.82 ?

- math -
**liz c**, Saturday, November 13, 2010 at 10:40pmI multipied first part times .02 and subtracted that twice

- math -
**liz c**, Saturday, November 13, 2010 at 10:41pmwheres the .98 from?

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**liz c**, Saturday, November 13, 2010 at 10:47pmthe answer was wrong

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**Reiny**, Saturday, November 13, 2010 at 10:48pmJust like when money increases by 1+i,

when the money decreases you would take 1-i

in this case i = .02

so value(1-.02)^2

when the rate was 13% did you not take 1 + .13 ?

suppose we do it step by step

start with 1000

that loses 2% so amount left = .98(1000) = 980

that gains 13%, so 980(1.13) = 1107.40

that loses 2% , so amount left = 1107.4(.98) = 1085.25

which gains 13% , 1085.25(1.13) = 1226.33

- math -
**Reiny**, Saturday, November 13, 2010 at 10:52pmyou said you multiplied your answer by 2% and then subtracted it twice ...

let's try that

2% of 1276.90 = 25.54

leaving 1251.36

2% of 1251.36 = 25.03

subtracting that leaves 1226.33

Well, well, what do you say now?

- math -
**liz c**, Saturday, November 13, 2010 at 10:56pmi put that answe ina and it was wrong

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