Percentage decrease = (Decrease / Original) &times; 100%.<br><br>&bull; Decrease = $1200 &minus; $999 = $201<br>&bull; Percentage decrease = \( \frac{201}{1200} \times 100\% \)<br>&bull; \( \frac{201}{1200} \times 100 = \frac{20100}{1200} = 16.75\% \)<br>&bull; Rounded to 1 decimal place: 16.8%<br><br>Final Answer: 16.8%