Question 154647
Total charges=Repair cost$ + labor ($/hr) 
Total charges=Repair cost + $34/hr------------> working eqn
: Take note the cost is constant and it only varies on the labor that depends on how many hours it will take to fix. But that's no problem since the estimate is given, we can calculate how many hours, oks.
For $226 total cost:
{{{226=175+(34/hr)}}}
{{{(226-175)/(34/hr)=0}}} 
{{{51/34=hr}}} 
{{{hr=1.5}}}
For $294 total cost:
{{{294=175+(34/hr)}}}
{{{(294-175)/(34/hr)=0}}}
{{{119/34=hr}}}
{{{hr=3.5}}}
In doubt? Let's check it out:
For $226:
{{{226=175+(34/cross(hr))*(1.5cross(hr))}}}
{{{226=175+51}}}
{{{226=226}}}
For $294:
{{{294=175+(34/cross(hr))*(3.5cross(hrs))}}}
{{{294=175+119}}}
{{{294=294}}}
There you go, it will take 1-1/2 to 3-1/2 hours for the labor.
Thank you,
Jojo