A small countertop installing company hires you to estimate their consumers weekly demand function for marble (per sq ft). The demand function is as follows: Qm = 5000-30Pm + 20Pg + 0.05Inc m= marble, g= granite and inc= average disposable income for home improvements in the surrounding area. Current prices: marble=40, granite=25 and disposable income-5000 Suppose during the supply change shortage the price of marble triples to $120. Determine the elasticity of demand at the new market price for marble. Answer is -1.67. Please explain how to get to this answer

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