#### Answer

The afternoon temperature is 50% greater than the morning temperature.

#### Work Step by Step

The new number is higher than the original number, so we use the equation for percent increase. The equation for percent increase is the following: $(\frac{new amount - original amount}{original amount})\times100$. Thus, we plug in the numbers to find: $(\frac{57-38}{38})\times100=50$% Using the equation, we find that the temperature did, indeed, increase by 50 percent.