The temperature dropped from $24^\circ C$ to $18^\circ C$. Find the percent decrease in the temperature.
Peter solved the problem: $$p=\frac{18}{24}=\frac{3}{4}=0.75\sim 75\%$$ And made the conclusion that the decrease in the temperature was $75\%$.
Is Peter's conclusion correct? If not, determine what the correct result should look like.
No, it is not correct. Peter's calculation can be used, but it needs to be interpreted differently. The temperature has dropped to $75\%$ of its original value, i.e., the decrease in the temperature was $25\%$.
Yes, it is correct.
No, it is not correct. The decrease in the temperature was $33\%$. Peter should have used the following calculation. $$p=\frac{24}{18}=1.\overline{3}\sim 133\%$$
No, it is not correct. The decrease in the temperature was $4\%$. Peter should have used the following calculation. $$p=\frac{24}{24-18}=\frac{24}{6}=4\sim4\%$$