What is 35% of 4/13 of 715? Choose the correct choice:
A) 44 B) 55 C) 66 D) 77 E) 88
This problem can be solved easily if we just use approximation: 35% is a little over 1/3, while 4/13 is a little less than 4/12, which is 1/3. Thus, the answer is about 1/3 of 1/3 of 715, or 1/9 of 715. Since the first 1/3 is a slight underestimate and the second 1/3 is a slight overestimate, the errors will partially cancel each other out. Our estimate will be relatively accurate.   The number 715 is about 720, so (1/9)*715 will be a bit less than 80.   Keeping track not only of your current estimate, but also of the degree to which you have overestimated or underestimated , can help you pinpoint the correct answer more confidently.   The closest answer is 77, so this is the answer to choose.   The answer is 77.
<result>D</result>
What is 35% of 4/13 of 715?