\( \begin{array}{l}\text { Find the percent change. Tell whether it is a percent increase or decrease. } \\ \text { from } 50 \text { to } 42 \\ \text { O } 16 \% \text { decrease } \\ 18 \% \text { decrease } \\ 18.6 \% \text { increase } \\ 18 \% \text { increase }\end{array} \)

To calculate the percent change from 50 to 42, you can use the formula: \[ \text{Percent Change} = \frac{\text{New Value} - \text{Old Value}}{\text{Old Value}} \times 100 \] Plugging in the numbers gives: \[ \text{Percent Change} = \frac{42 - 50}{50} \times 100 = \frac{-8}{50} \times 100 = -16\% \] This indicates a 16% decrease. Setting up a quick mental math check can help you minimize errors in similar situations. Always remember that if the final amount is lower than the initial amount, you’re looking at a decrease. Conversely, if it’s higher, it’s an increase. Writing it out helps solidify your understanding! If you want to explore more about percent changes, consider diving into financial literacy resources. They often cover practical applications of percent changes in budgeting, investing, and analyzing data trends. Understanding how to interpret these can be a game changer in your everyday decisions!