Hi All,
This question can be solved by TESTing Values (although since the prompt discusses 'fractions of a 1/2 mile' iit's 'hinting' that we should be thinking about non-integers...
Let's TEST R = 2.1
According to the prompt, for a 2.1-mile trip, the taxi company will charge $2 + $0.75(5) = $5.75
When we plug R = 2.1 into the answers, and we follow the definition of [x], we get....
Answer A: 2 + 1 = 3 NOT a match
Answer B: 2 + 1.5 = 3.5 NOT a match
Answer C: 2 + 2.25 = 4.25 NOT a match
Answer D: 2 + 4 = 6 NOT a match
Answer E: 2 + 3.75 = 5.75 This IS a match
Final Answer:
GMAT assassins aren't born, they're made,
Rich
Instead of using a decimal I picked 2 and 4 as the TEST it numbers (I tested 4 except for 2, because 2 was valid for both D and E) was my approach incorrect? Was I lucky to get the correct answer? Is it necessary to use decimals in this specific problem?