ANS:
3= (D) because as u can see more items of consumer goods are given up as more of capital goods are produced.
Initiall/ close to zero capital goods no or nothing of consumer goods was given up
But as it increases close to PPC curve near Y axis almost all consumer goods are given up to produce
Capital goods.
7 = (B) u can calculate & see the, formulae is % change in Demand/ % change in income, Here expenditure =
Demand. Hint : it cant be the last one as it has a negetive relationship, it cant be C because it has a 0 income elasticity . As demand has 0 change to + change in income.So calculate for the other two to see if income elasticity is between 0 & 1