Rate is about how many of something in a specific amount of time. I learn English at a rate of ten words per day. We need to improve the rate of growth. I think the word you want is ratio. Ratio is usually expressed as 60:40, rather than 60%, but you can use a percentage. You would usually explain what the types are though. The ratio of married people to single people is 54:46. The ratio of boys to girls is 60:40 in my class. You could also use proportion. The proportion of married adults is 54%. In this case, you wouldn't normally say how many people belong in the other group. It's a bit more flexible than ratio because you can have many groups. For example, the proportion of English learners on iTalki is 62%. The proportion of people studying German is very low, less than the proportion studying Chinese. (But this example is an ugly sentence. Be careful not to use the same word too many times!)

No. Rate = change per unit time = x/minute. 100 miles/hour was his rate of motion. That generator uses gasoline at a rate 1 gallon per hour. Use fraction or proportion or ratio or percentage.

thanks

using "percentage" here will be better. "rate" is barely used in this way. tax rate, pay rate, crime rate is ok.