The relationship between tax rate and income which is relevant to a proportional tax is depicted by? by Sunday | Mar 29 | Economics JAMB | 0 comments A. curve Z and Y B. curve X C. curve Z D. curve Y Correct Answer: Option D = curve Y Users Also Read These:According to the income approach to national income…If the death rate of a country is 52% and the growth…A tax system in which the income earner pays a fixed…If tax takes a large proportion of the income of…Proportional tax is a tax whose?