Suppose that there are two commodities in the marketplace (X an Y ) and they are (5) completely unrelated in consumption. (They are neither compliments or substitutes.) The compensated demand elasticity for X is ηx = −0.6 and the compensated elasticity for Y is ηy = −0.4. If a 15% sales tax is applied to good X, according to the Ramsay Tax Rule, how much should the tax on Y be?