Answer
In the short run ridership will decrease to 94000. In the long run it will decrease to 84000.
Work Step by Step
$\Delta\ qty=\Delta\ price\times E_d$
$\Delta\ qty=\frac{2.20-2.00}{2.00}\times100\times0.6$
$\Delta\ qty=\frac{0.20}{2.00}\times100\times0.6$
$\Delta\ qty=10\times0.6$
$\Delta\ qty=6\%$
$100000-(100000\times6\%)=100000-6000=94000$
$\Delta\ qty=\Delta\ price\times E_d$
$\Delta\ qty=\frac{2.20-2.00}{2.00}\times100\times1.6$
$\Delta\ qty=\frac{0.20}{2.00}\times100\times1.6$
$\Delta\ qty=10\times1.6$
$\Delta\ qty=16\%$
$100000-(100000\times16\%)=100000-16000=84000$
