The function Q = F(p,ps,y) describes how the monthly demand, Q (measured in 100s of Widgets), for Grinch Inc. Widgets depends on the variables: • p = the price/Widget that Grinch Inc. sets (measured in $). • Ps= average price of substitutes for Grinch Inc. Widgets (measured in $). y = average disposable income in the market for Widgets (measured in $1000s). When average disposable income in the market is $4200 and Grinch Inc.s price is $12 and the average price of substitutes is $11... Q = 66 2p = -0.28 = Qps 0.52 Qy = 0.31 If average monthly income increases to $4400 and the average price of substitutes increases to $11.35, by approximately how much can Grinch Inc. increase their price while keeping demand for their Widgets fixed at Q = 66 ? There is no way to estimate this from the given information.. Ap = 0.72 Ap = 0.87 ∆р = 0.53