Explain the relationship

Explain the relationship between Price Elasticity of Demand and Marginal Revenue with the help of a diagram.

There is a close relationship between Ed and MR:
(i) When MR is positive, {{E}_{d}} > 1.
(ii) When MR is zero, {{E}_{d}} = 1.
(iii) When MR is negative, {{E}_{d}} < 1.
The above relationship is illustrated with the help of adjoining diagram:
MR = AR[1-1/e] or P[1-1/e]