1. **State the problem:** We need to find the percentage of all animals treated during the weekend that were guinea pigs. 2. **Given data:** - Saturday: 200 animals treated - Sunday: 175 animals treated - Percentage of guinea pigs on Saturday: 52% - Percentage of guinea pigs on Sunday: 24% 3. **Calculate the number of guinea pigs treated each day:** - Saturday guinea pigs: $200 \times \frac{52}{100} = 104$ - Sunday guinea pigs: $175 \times \frac{24}{100} = 42$ 4. **Calculate total animals treated during the weekend:** $$200 + 175 = 375$$ 5. **Calculate total guinea pigs treated during the weekend:** $$104 + 42 = 146$$ 6. **Calculate the percentage of guinea pigs out of all animals treated:** $$\frac{146}{375} \times 100 = 38.93\%$$ 7. **Round to the nearest 1%:** $$39\%$$ **Final answer:** 39% of all the animals treated during the weekend were guinea pigs.