4. (12 points) The demand for cat litter, in pounds, is InD(p) = 1000 -p + In(m), where p is the price of cat litter and m is income. a. What is the price elasticity of demand for kitty litter when p = 2 and m = 500? b. What is the income elasticity of demand for kitty litter when p = 2 and m = 500? c. What is the price elasticity of demand when price is p and income is m? The income elasticity of demand