You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.

[EX Q]: Question: There are 600 employees in a room. 99% are managers. How many managers must leave the room to bring down the percentage of managers to 98%?

 Option A: 100

 Option B: 200

 Option C: 250

 Option D: 300

 Option E: 400
[EX A]: Option D

[EX Q]: Question: If a man crosses a 600 m long street in 5 minutes. What is his speed?

 Option A: 7 km/hr

 Option B: 7.1 km/hr

 Option C: 7.2 km/hr

 Option D: 8 km/hr

 Option E: 8.5 km/hr
[EX A]: Option C

[EX Q]: Question: In how many years does a sum of Rs. 6000 yield a simple interest of Rs. 15000 at 15% p.a.?

 Option A: 16.66 years

 Option B: 17.66 years

 Option C: 18.66 years

 Option D: 19.66 years

 Option E: 20.66 years
[EX A]:
Option A