Source: Princeton Review
During a special promotion, a certain filling station is offering a 10 percent discount on gas purchased after the first 10 gallons. If Kim purchased 20 gallons of gas, and Isabella purchased 25 gallons of gas, then Isabella's total per-gallon discount is what percent of Kim's total per-gallon discount?
A. 80%
B. 100%
C. 116.7%
D. 120%
E. 140%
The OA is D.
Durign a special promotion, a certain filling station is
This topic has expert replies
-
- Moderator
- Posts: 2205
- Joined: Sun Oct 15, 2017 1:50 pm
- Followed by:6 members
Timer
00:00
Your Answer
A
B
C
D
E
Global Stats
GMAT/MBA Expert
- Jay@ManhattanReview
- GMAT Instructor
- Posts: 3008
- Joined: Mon Aug 22, 2016 6:19 am
- Location: Grand Central / New York
- Thanked: 470 times
- Followed by:34 members
Say the price of per gallon of gas = $1BTGmoderatorLU wrote:Source: Princeton Review
During a special promotion, a certain filling station is offering a 10 percent discount on gas purchased after the first 10 gallons. If Kim purchased 20 gallons of gas, and Isabella purchased 25 gallons of gas, then Isabella's total per-gallon discount is what percent of Kim's total per-gallon discount?
A. 80%
B. 100%
C. 116.7%
D. 120%
E. 140%
The OA is D.
Thus,
Total discount received by Kim = 10% of 1*(20 - 10) = $1
Kim's total per-gallon discount = 1/20 = $0.05
Total discount received by Isabella = 10% of 1*(25 - 10) = $1.50
Kim's total per-gallon discount = 1.5/25 = $0.06
Thus,
Isabella's total per-gallon discount is (0.06 / 0.05)*100% = 120% of Kim's total per-gallon discount
The correct answer: D
Hope this helps!
-Jay
_________________
Manhattan Review
Locations: Manhattan Review Warangal | GMAT Prep Dilsukhnagar | GRE Prep Begumpet | Visakhapatnam GRE Coaching | and many more...
Schedule your free consultation with an experienced GMAT Prep Advisor! Click here.
GMAT/MBA Expert
- Scott@TargetTestPrep
- GMAT Instructor
- Posts: 7223
- Joined: Sat Apr 25, 2015 10:56 am
- Location: Los Angeles, CA
- Thanked: 43 times
- Followed by:29 members
Let's assume that the price per gallon of gas is $10. Thus, the discounted price per gallon of gas after the first 10 gallons is 0.9 x 10 = $9. In other words, after the first 10 gallons, each additional gallon has a $1 discount in price.BTGmoderatorLU wrote:Source: Princeton Review
During a special promotion, a certain filling station is offering a 10 percent discount on gas purchased after the first 10 gallons. If Kim purchased 20 gallons of gas, and Isabella purchased 25 gallons of gas, then Isabella's total per-gallon discount is what percent of Kim's total per-gallon discount?
A. 80%
B. 100%
C. 116.7%
D. 120%
E. 140%
Now let's calculate the total discount for each person. Since Kim purchased 20 gallons of gas, the 10 additional gallons (that is, after the initial 10 gallons) will receive a $10 discount, so her total per-gallon discount is 10/20 = $0.50. Since Isabella purchased 25 gallons of gas, the 15 additional gallons (that is, after the initial 10 gallons) will receive a $15 discount, so her total per-gallon discount is 15/25 = $0.60. Therefore, Isabella's total per-gallon discount is 0.60/0.50 = 6/5 = 1.2 = 120% of Kim's total per-gallon discount.
Answer: D
Scott Woodbury-Stewart
Founder and CEO
[email protected]
See why Target Test Prep is rated 5 out of 5 stars on BEAT the GMAT. Read our reviews