(i) False, when Total Revenue is constant,Average Revenue.will be diminishing.
(ii) False, when Marginal Revenue is zero, Average Revenue will be diminishing.
(iii) False, Marginal Revenue can never be the price at which the last unit of the commodity sold. It simply refers to additional revenue, when an additional unit of output is sold.
(iv) False, because when Marginal Revenue is positive and constant, Total Revenue increases at constant rate but Average Revenue tends to be equal to Marginal Revenue.