Question

sarahs investment in stock grew 28% to $512 how much did she invest

Answer 1

WELCOME TO OPENSTUDY!!!!

Answer 2

now what we have to figure out here is what number increased by 28 percent is equal to 512

Answer 3

i think @jdoe0001 can help from here :)

Answer 4

well
she invested ... some amount, whatever that was, her stock went up to 512

so.. .we know that, the amount she had before was say "something" that was 100%
and 512 is just 100% plus the added quantity, to give 100% + 28%
thus
512 is 128% of the original amount

so, if 512 is the 128%, what was the original amount anyway?
\(\begin{array}{ccllll}
amount&\%
\\\hline\\
512&128\\
x&100
\end{array}\implies \cfrac{512}{x}=\cfrac{128}{100}\)

solve for "x", to get, the original stock price, then just find the difference between 512 and that

Answer 5

its 28% not 128