Answer:
Jess's bill amount without tip: B
Jess's tip amount: 0.21B.
Jess's total bill amount:

Step-by-step explanation:
We have been given that Jess has dinner at a restaurant. The dinner bill is B dollars. So the Jess's bill amount without tip will be B dollars.
We are told that she pays a 21% tip. Let us find 21% tip of dinner bill (B).


Therefore, Jess's tip amount will be
.
Let us find total amount of Jess's bill by adding bill amount (0.21B) to the Jess's bill amount without tip (B).

Therefore, the total amount of Jess's bill will be
.