The supply plan of a pen company is price point quantity A 4 40 B 6 80 C 8 120 D 10 160 E  12 200 Calculate the point price elasticity of supply for each of the given prices and determine whether the answer is elastic, inelastic, or unitary. Note: remember that for this problem you need the slope (M) of the supply equation, you have to calculate it in order to solve.