Answer
See below.
Work Step by Step
(1) If the annual salary is $\$20\text{million}$ for $50000$ years, then in total he will get $50000\cdot\$20\cdot10^6=10^{12}=1$ trillion.
(2) If there are $40816326$ cars on average costing $\$24500$ each, then in total they cost $\$24500\cdot40816326=9.9\cdot10^{11}\approx1$ trillion.
(3) If there are $5574136$ homes on "average" costing $\$179400$ each, then in total they cost $\$179400\cdot5574136=9.9\cdot10^{11}\approx1$ trillion.
