<PRE><B>Question 84157</B>
solve 
A defense attorney charges her client $4000 plus 120 per hour. The formula R=120n+4000 gives her revenue in dollars for n hours of work. (A) What is her revenue for 100 hours of work? (B) What is her revenue for 101 hours of work? (C)By how much did the one extra hour of work increase the revenue? 
:(A)
Let n=100 and slove for R
R=120(100)+4000
R=12000+4000
R=$16000
: (B)
Let n=101 and solve for R
R=120(101)+4000
R=12120+4000
R=$16120
:(C)
R(101)-R(100)=16120-16000=$120
Happy Calculating!!!!</PRE>