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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