Posted by k on Thursday, May 28, 2009 at 8:06pm.
If 28% of a sum is $100.80, what is the sum?
A. $129.02
B. $277.78
C. $282.24
D. $360.00
how can i do this

math  Ms. Sue, Thursday, May 28, 2009 at 8:09pm
Change 28% to a decimal. Let x = the sum.
0.28x = 100.8
x = 100.8/0.28
x = ?

math  k, Thursday, May 28, 2009 at 8:17pm
i got the answer it's D thanks
how did you figure out which operation to use.

math  Ms. Sue, Thursday, May 28, 2009 at 8:21pm
I thought  28% of what is 100.80?  and then put it in algebraic terms.
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