The table indicates how one person’s weekly consumption of biscuits and coffee changes as income changes. Income $100: biscuits 0 packs, coffee 5 cups. Income $150: biscuits 5 packs, coffee 10 cups. Which statement about the income elasticity of demand across the income range shown is correct?
- AFor biscuits it is greater than 1.
- BFor biscuits it is zero.
- CFor coffee it is less than 1.
- DFor coffee it is unitary.