Answer:
30%
Explanation:
First, you must add all of the pets together to get a whole. 4+3+2+1=10. Since you need to find the percent of cats specificially, write the expression as 3/10. Since 3/10=0.3, you need to multiply a decimal by 100 to get the equivalent percent. 0.3x100=30%, so the answer is 30%.