math

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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 -

Change 28% to a decimal. Let x = the sum.

0.28x = 100.8
x = 100.8/0.28
x = ?

• math -

i got the answer it's D thanks
how did you figure out which operation to use.

• math -

I thought -- 28% of what is 100.80? -- and then put it in algebraic terms.

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