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 price of t. v set is reduced by 20 %, then its sale increases by 80 %, find net effect on sale value
Options: a. 44, b. 45, c. 46, d. 47, e. 48
[EX A]: a

[EX Q]: Problem: what is the least number of squares tiles required to pave the floor of a room 15.17 m long and 9.02 m broad ?
Options: ['a. 814', 'b. 266', 'c. 287', 'd. 999', 'e. 661']
[EX A]: a

[EX Q]: Problem: a dishonest dealer professes to sell goods at the cost price but uses a weight of 990 grams per kg, what is his percent ?
Options: a. 1.01 %, b. 25 %, c. 22 %, d. 29 %, e. 45 %
[EX A]:
a