To find the percent error, we need to calculate the difference between the predicted amount ($30) and the actual amount spent ($19.75), and then express that difference as a percentage of the predicted amount.
The difference is $30 - $19.75 = $10.25.
To express this as a percentage of the predicted amount, we divide by $30 and multiply by 100:
($10.25 / $30) * 100 = 34.17
Rounding to the nearest whole number, the percent error is 34%.
Sarah plans to buy books at a book fair she thinks she will need $30 to purchase the books she only spends $19.75. Find the percent error in her prediction round your answer to the nearest whole number.
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