Marisa found a shin that had a \( 20 \% \) markdonn on it. If the price of the shirt is represented by \( x \), then how much does the shirt cost (axclurfing tax)? A. 0.202 B. 0.801 C. \( z=0.80 \mathrm{x} \) D. \( x(0.20+1.00) \)

Marisa discovered a shirt that had a \( 20\% \) markdown, which means that she pays \( 80\% \) of the original price. Thus, the cost of the shirt can be represented as \( 0.80x \). This represents retaining \( 80\% \) of the original price ($x$) after the discount. If you want to incorporate taxes into the final cost, you would multiply the price after the discount by the tax rate plus one (to include the original price). If the tax rate is \( t \), the cost would then be represented as \( 0.80x(1+t) \). This method ensures that you're accounting for both the markdown and the tax appropriately!