Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.

[EX Q]: Problem: if x gets 25 % more than y and y gets 20 % more than z, the share of z out of rs. 1110 will be :
Options: a. rs. 300, b. rs. 200, c. rs. 240, d. rs. 350, e. none of these
[EX A]: a

[EX Q]: Problem: if a lends rs. 3150 to b at 8 % per annum and b lends the same sum to c at 12.5 % per annum then the gain of b in a period of 2 years is ?
Options: a. 280, b. 295, c. 283.5, d. 245, e. 200
[EX A]: c

[EX Q]: Problem: find the compound interest on $ 1000 in 2 years at 4 % per annum, the interest being compounded half - yearly ?
Options: a. $ 645.56, b. $ 82.43, c. $ 954.26, d. $ 745.69, e. $ 1020.45
[EX A]:
b