Homework Help: Pre-Algebra

Posted by Dean on Tuesday, October 27, 2009 at 11:30pm.

Can I have someone check this please?
I wouldn't want to do the whole page, then find out I had done them all wrong. :(

[Percents of Change]

A $100 digital watch is now $72
Decrease, 72/100 = negative percent.
100/72.00 = .72
.72 - 1 = 30%?

Thanks.

30% is my final answer, correct?

Pre-Algebra - Reiny, Tuesday, October 27, 2009 at 11:50pm
so, isn't the change in the price $28 ?

so percent of change is 28/100 = 28%

Your last two lines make no sense.
100/72.00 = .72 ??
100/72 = 1.388889 not .72
(why are you dividing 100 by 72 in the first place?)

.72 - 1 = 30%? ????? How can that be 30% ?
.72 - 1 = -.28
Pre-Algebra - Dean, Tuesday, October 27, 2009 at 11:57pm
Well, sorry -.-

Thanks for the answer, lol.

I thought it would be 28.
Pre-Algebra - Seth, Wednesday, October 28, 2009 at 12:34am
Can you type the full question to give us the depreciation rate???

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