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14 Mar 2026, 09:17
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
76% (03:09) correct
24%
(02:13)
wrong
based on 21
sessions
History
Date
Time
Result
Not Attempted Yet
Ahmad wants to buy 10 jars of diced tomatoes. The regular price per jar is the same at two supermarkets, Sureway and Teslo. At Sureway, for every three jars bought at the regular price, a fourth jar is free. At Teslo, for each jar purchased at the regular price, a second jar can be purchased at a 70 percent discount. What percent less would Ahmad pay at Teslo than at Sureway for the 10 jars?
A. 12.5%
B. 15%
C. 18.75%
D. 20%
E. 25%
A. 12.5%
B. 15%
C. 18.75%
D. 20%
E. 25%
14 Mar 2026, 09:29
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Key concept: Percent and Interest Problems — Comparing two discount structures for the same quantity.
The common trap here is forgetting that the two deals work differently at 10 cans. Let me set up the comparison carefully.
Let p = the regular price of one can.
Step 1 — Sureway cost for 10 cans ("buy 3 at full price, get the 4th free")
- Round 1: Pay for 3, receive 4 cans. Cost = 3p.
- Round 2: Pay for 3, receive 4 more cans. Cost = 3p.
- That's 8 cans for 6p. You still need 2 more.
- Round 3: Buy 2 cans at full price (can't trigger the deal without buying 3). Cost = 2p.
- Total Sureway cost = 3p + 3p + 2p = 8p.
Step 2 — Teslo cost for 10 cans ("each full-price can allows one additional can at 70% discount")
- Every pair of cans: one at p, one at 0.30p.
- Ahmad buys 5 pairs: 5 cans at p + 5 cans at 0.30p.
- Total Teslo cost = 5p + 1.5p = 6.5p.
Step 3 — Percent difference
(8p − 6.5p) / 8p × 100 = 1.5/8 × 100 = 18.75%
Answer: C
The trap most students fall into is assuming the 3rd partial round at Sureway is negligible, or miscounting how many "free" cans apply to 10. For 10 cans you only get 2 free cans at Sureway (not 3), which matters a lot.
Takeaway: When two discount deals are compared, always work through an explicit count for the exact quantity asked, rather than extrapolating from the basic deal structure.
— Kavya | GMAT Focus 725 (99th percentile)
The common trap here is forgetting that the two deals work differently at 10 cans. Let me set up the comparison carefully.
Let p = the regular price of one can.
Step 1 — Sureway cost for 10 cans ("buy 3 at full price, get the 4th free")
- Round 1: Pay for 3, receive 4 cans. Cost = 3p.
- Round 2: Pay for 3, receive 4 more cans. Cost = 3p.
- That's 8 cans for 6p. You still need 2 more.
- Round 3: Buy 2 cans at full price (can't trigger the deal without buying 3). Cost = 2p.
- Total Sureway cost = 3p + 3p + 2p = 8p.
Step 2 — Teslo cost for 10 cans ("each full-price can allows one additional can at 70% discount")
- Every pair of cans: one at p, one at 0.30p.
- Ahmad buys 5 pairs: 5 cans at p + 5 cans at 0.30p.
- Total Teslo cost = 5p + 1.5p = 6.5p.
Step 3 — Percent difference
(8p − 6.5p) / 8p × 100 = 1.5/8 × 100 = 18.75%
Answer: C
The trap most students fall into is assuming the 3rd partial round at Sureway is negligible, or miscounting how many "free" cans apply to 10. For 10 cans you only get 2 free cans at Sureway (not 3), which matters a lot.
Takeaway: When two discount deals are compared, always work through an explicit count for the exact quantity asked, rather than extrapolating from the basic deal structure.
— Kavya | GMAT Focus 725 (99th percentile)
