In Exercises $53$ through $58,$ write a program to carry out the stated task. ${?}^2$

$53.$ Server's Tip Calculate the amount of a server's tip, given the amount of the bil and the percentage tip as input. See Fig. $2\mathrm{.}23.$

Enter amount of bill: $21\mathrm{.}50$

Enter percentage tip: $18$

Tip: $$3\mathrm{.}87$

Enter revenue: $550000$

Enter expenses: $410000$

Net income: $$140,000\mathrm{.}00$