Last nine weeks Josef had an 88% average in math class. This nine weeks he earned a 92%. By what percent did Josef's math grade change? Is it an increase or decrease?
To find the percent change in Josef's math grade, we can subtract his previous average (88%) from his current average (92%) and then divide by his previous average and multiply by 100.
Percent change = ((92% - 88%) / 88%) * 100
Percent change = (4 / 88) * 100
Percent change = 0.045 * 100
Percent change = 4.5%
Therefore, Josef's math grade increased by 4.5%.