yes because a ratio is a rate so a rate would have to be a ratio
Internal rate of return is a ratio in which
A percent is a ratio, or rate, that compares a number to100
No. It can be but need not be. For example, you might calculate the ratio of today's temperature in Celsius and in Fahrenheit and calculate the ratio. That is not a rate.
Yes, it is.
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The higher the ratio, the faster the rate of diffusion
A unit rate is a ratio: it does not have a solution!