Compute the price elasticities from the following data,
	and fill in Total Expenditure (TE) & the change in TE.
	[NOTE: #DIV/0! Is right when dividing by 0.]
	The demand curve in a market is	P = 200 - 2Q.	Q=P-200/2
			price		change in
	P	Q	elasticity	TE	TE
	200	300	NONE		NONE
	160	260
	120	220
	80	180
	40	140
	0	100
			0.5	0.2	0.3
2. Income & Cross-Price Elasticity