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: The sector of a circle has radius of 42 cm and central angle 135o. Find its perimeter?

Option A: 91.5 cm

Option B: 92.2 cm

Option C: 28.9 cm

Option D: 29.2 cm

Option E: 183 cm
[EX A]: Option E

[EX Q]: Question: A sum of Rs.4800 is invested at a compound interest for three years, the rate of interest being 10% p.a., 20% p.a. and 25% p.a. for the 1st, 2nd and the 3rd years respectively. Find the interest received at the end of the three years?

Option A: Rs.3129

Option B: Rs.3120

Option C: Rs.3108

Option D: Rs.3106

Option E: Rs.3127
[EX A]: Option B

[EX Q]: Question: A petrol pump owner mixed leaded and unleaded petrol in such a way that the mixture contains 10% unleaded petrol. What quantity of leaded petrol should be added to 1 ltr mixture so that the percentage of unleaded petrol becomes 5%?

Option A: 1000 ml

Option B: 900 ml

Option C: 1900 ml

Option D: 1800 ml

Option E: None of these
[EX A]:
Option A