Question

The sales tax on a one-half-carat diamond ring is $76. Find the purchase price of the ring (before tax) of the sales tax rate is 9.5%.

Answer 1

so.. hmmm if we take "x" to be the 100% sale price before tax, $76 is really 9.5% of that

thus
`\bf \begin{array}{ccllll} amount&\%\\ \textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash\\ 76&9.5\\ x&100 \end{array}\implies \cfrac{76}{x}=\cfrac{9.5}{100}`

solve for "x"