有關tax revenue - 經濟

assume the price of gasoline is 2.4 per gallon and the equilibrium quantity of
gasoline is 12 million per day with no tax on gasoline . Starting from this
inotial situation,which of the following scenarios would result in the largest
deadweight loss?

A 10 percent increase in the price of gasoline reduces the quantity of gasoline
demanded by 2 percent and it increses QS by 7 percent. The tax is 0.4 per gallon

B 10 percent increase in the price of gasoline reduces QD by 1 percent and it
increases QS by 8 percent. The tax is 0.35 per gallon

我想知道是否價格與數量變化可代表整條斜率？斜率可代表某條需求縣Or供給線的彈性？
而整條線的彈性可稱the price elasity of demand/supply?還是要線上的點才行?

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