From a survey conducted on 100 households of "Serity" Soap consumer, the request function is obtained as follows:

Qdx = 26.0071 - 3.6075 Px + 2.4490 Py - 1.5066 Y + 2.050 A

Information:

Px = Price of Bath soap Nona; Y = Household income

Py = Price of soap Sayang; A = Promotion costs

In relation to the above equation:

a)Interpret the quantitative analysis results above

b)What is the price elasticity, cross elasticity, income and promotion elasticity, if it is known that Qx is mean = 90, Px = 30, Py = 25, Y = 200 and A = 50

c)What policies can management do in increasing sales volume.

d)If the sales manager wants to increase sales by 15%, how much should the promotion cost be increased, ceteris varibus

e)Determine the demand curve.