Not so sure.. but I got 9.6 meters below water level.
The formula of combination is

We have

and


Hence, there are 1001 ways of arranging 10 records from 14 records
Y+2=(x+2) z+3=(y+3) a+4=(z+4)
Emily is 12, Samantha is 14, and Lauren is 16. Basically all you do to solve this problem is add numbers that are two apart until you find something.
Ex. 2+4+6=12 4+6+8=18 so on and so forth.
If the price is marked down 24%, that means it is 100-24 = 76% of the original. So we know that $364 is 76% of the original price. x * 0.76 = 364, x = 364/0.76 = $478.95. Make sense?