Chapter 5 - Elasticity: A Measure of Responsiveness - Exercises - 5.2 Using Price Elasticity - Page 122: 2.12

Demand for medical care would decrease by 6.7% for poor households but only 0.3% for wealthy households.

$\Delta\ qty=\Delta\ price\times E_d$ $\Delta\ qty=10\times0.67$ $\Delta\ qty=6.7\%$ $\Delta\ qty=\Delta\ price\times E_d$ $\Delta\ qty=10\times0.03$ $\Delta\ qty=0.3\%$