Cost per crate is 8$.
Now he lost 2 crates out of 10 that means quantity lost is 20%. To recover loss from this loss he should increase price by 25% ( 2/10 loss in quantity => 2/8 rise in cost on remaining for break-even). Thus break-even price for remaining 8 crates is 10 $ (8*125/100 or 8* 10/8).

Now he wants 25% profit on top of this. So he should raise break-even price by 25%. So the answer is 12.5$


Kudos if you like the approach!!!!
_________________

Impossibility is a relative concept!!

The total cost is $80. In order to earn a total profit of 25% the total sales must be 80*1.25 = $100.

Thus he must sell each of he remaining crates for 100/8 = $12.5.

Answer: D.
_________________

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:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

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