To determine the percent of change from the production cost of the mobile device to its selling price, we can use the formula for percent change:
\[ \text{Percent Change} = \frac{\text{Change}}{\text{Original Value}} \times 100 \]
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Determine the change: \[ \text{Change} = \text{Selling Price} - \text{Cost Price} = 1499 - 558 = 941 \]
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Using the original value (the cost price, which is 558): \[ \text{Percent Change} = \frac{941}{558} \times 100 \]
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Calculate the percent change: \[ \text{Percent Change} \approx \frac{941}{558} \approx 1.6844 \] \[ 1.6844 \times 100 \approx 168.44% \]
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Round to the nearest whole percent: \[ \text{Percent Change} \approx 168% \]
Thus, the percent of change in this situation is approximately 168%.
To fill in your proportion format: \[ \frac{941}{558} = \frac{\text{Percent Change}}{100} \] Where "blank" can be filled as \( 941 \) and \( 558 \).