Convert $12.5\%$ to both a fraction in simplest form and its decimal equivalent.

Translate the following sentence into an algebraic equation: "$x$ is $25\%$ of $200$." Which equation correctly represents the sentence?

A jacket priced at $\$250$ is discounted by $30\%$. A $7\%$ sales tax is then applied to the discounted price. What is the final price?

Jake borrows $\$2,000$ at a simple interest rate of $4.5\%$ per year for $3$ years. How much interest will he owe at the end of the $3$-year period?

A boutique marks up an item by $20\%$ from wholesale and later discounts it by $20\%$ off the marked price. What is the net effect on the price?