SOLUTION: John is deciding between two jobs. One promises convenient hours and is closer to his home. The other pays $2.25 more per hour, and John would earn $1,000 in 10 hours less than i

Algebra ->  Rate-of-work-word-problems -> SOLUTION: John is deciding between two jobs. One promises convenient hours and is closer to his home. The other pays $2.25 more per hour, and John would earn $1,000 in 10 hours less than i      Log On


   



Question 1035397: John is deciding between two jobs. One promises convenient hours and is closer to his
home. The other pays $2.25 more per hour, and John would earn $1,000 in 10 hours less
than it will take him to earn $900 at the first job. What is the hourly wage for each job?

Found 3 solutions by stanbon, josmiceli, MathTherapy:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
John is deciding between two jobs.
One promises convenient hours and is closer to his home.
The other pays $2.25 more per hour, and John would earn $1,000 in 10 hours less
than it will take him to earn $900 at the first job. What is the hourly wage for each job?
-----
1st job DATA:
hrs = h ; rate = r ; earnings = r*h = 900
---
2nd job DATA:
hrs = h-10 ; rate = r+2.25 ; earn = (r+2.25)*(h-10)
-----
Equation:
(r+2.25)(h - 10) = 1000
rh - 10r + 2.25h = 1000
900 - 10r + 2.25h = 1000
2.25h = 100 + 10r
2.25(900/r) = 100 + 10r
10r^2 + 100r - 2025 = 0
r = $10.08
----
1st job rate = r = $10.08 per hr.
2nd job rate = r+2.25 = $12.33 per hr.
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Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +r+ = rate in dollars/hr for the job
paying less per hour
+r+%2B+2.25+ = rate in dollars/hr for he job
paying more per hour
Let +t+ = time to earn $900 at lower paying job
+t+-+10+ = time to earn $1,000 at higher paying job
-----------------------------------------------
(1) +1000+=+%28+r+%2B+2.25+%29%2A%28+t+-+10+%29+
(2) +900+=+r%2At+
-----------------
(2) +t+=+900%2Fr+
and
(1) +1000+=+r%2At+%2B+2.25t+-+10r+-+22.5+
(1) +1000+=+t%2A%28+r+%2B+2.25+%29+-+10r+-+22.5+
(1) +1000+=+%28+900%2Fr+%29%2A%28+r+%2B+2.25+%29+-+10r+-+22.5+
(1) +1000+=+900+%2B++2025%2Fr+-+10r+-+22.5+
(1) +122.5+=+2025%2Fr+-+10r+
Multiply both sides by +r+
(1) +122.5r+=+2025+-+10r%5E2+
(1) +10r%5E2+%2B+122.5r+-+2025+=+0+
(1) +100r%5E2+%2B+1225r+-+20250+=+0+
(1) +4r%5E2+%2B+49r+-+810+=+0+
Solve with quadratic formula
+r+=+%28+-b+%2B-+sqrt%28+b%5E2+-+4%2Aa%2Ac+%29%29+%2F+%282%2Aa%29+
+a+=+4+
+b+=+49+
+c+=+-810+
+r+=+%28+-49+%2B-+sqrt%28+49%5E2+-+4%2A4%2A%28-810%29+%29%29+%2F+%282%2A4%29+
+r+=+%28+-49+%2B-+sqrt%28+2401+%2B+12960+%29%29+%2F+8+
+r+=+%28+-49+%2B-+sqrt%28+15361+%29%29+%2F+8+
+r+=+%28+-49+%2B+123.94+%29+%2F+8+
+r+=+74.94+%2F+8+
+r+=+9.37+
and
+r+%2B+2.25+=+20.99+
-------------------
Lower paying rate is $9.37 / hr
Higher paying rate is $20.99 / hr
-----------------------------
check answers:
(2) +900+=+r%2At+
(2) +900+=+9.37%2At+
(2) +t+=+96.05+
and
(1) +1000+=+%28+r+%2B+2.25+%29%2A%28+t+-+10+%29+
(1) +1000+=+%28+9.37+%2B+2.25+%29%2A%28+t+-+10+%29+
(1) +1000+=+11.62%2A%28+t+-+10+%29+
(1) +1000+=+11.62t+-+116.2+
(1) +1116.2+=+11.62t+
(1) +t+=+96.06+
close enough -hope I got it!

Answer by MathTherapy(10555) About Me  (Show Source):
You can put this solution on YOUR website!

John is deciding between two jobs. One promises convenient hours and is closer to his
home. The other pays $2.25 more per hour, and John would earn $1,000 in 10 hours less
than it will take him to earn $900 at the first job. What is the hourly wage for each job?
Lower-paying job's hourly rate: highlight_green%28matrix%281%2C3%2C+9.3674%2C+%22=====%3E%22%2C+%22%249.37%22%29%29   
Higher-paying job's hourly rate: 9.3674 + 2.25, or highlight_green%28matrix%281%2C3%2C+11.6174%2C+%22=====%3E%22%2C+%22%2411.62%22%29%29