A merchant claims a loss of 4% on coffee but uses a weight of 840 gms instead of 1 kg to sell the coffee. The merchant actually makes a

A. 11 \(\frac{1}{7}\) % gain

B. 14 \(\frac{2}{7}\) % gain

C. 4% loss

D. 4% gain

E. 2% gain
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Say the cost price is 1 cent for a gram, so the cost price of 1000 grams is 1000 cents. 4% loss means that the merchant sells for 960 cents.

Actually he sells 840 grams for 960 cents. The cost of 840 grams is 840 cents, so the actual gain is (960 - 840)/840 = ~14%.

Answer: B.

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Hope this helps.
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New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
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Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics