Bob wants to run a mile in the same time as his sister. If Bob’s time for a mile is currently 10 minutes 20 seconds and his sister’s time is currently 9 minutes 36 seconds, by what percent does Bob need to improve his time in order run a mile in the same time as his sister?	Select the correct option.
A) 3%  B) 5%  C) 7%  D) 10%  E) 12%
Bob's time = 620 secs.   His sis' time = 576 secs.   Percent increase needed = (620-576/620) * 100 = 44/640 * 100 = 7%. Ans (7%).
<result>C</result>
Bob wants to run a mile in the same time as his sister. If Bob’s time for a mile is currently 10 minutes 20 seconds and his sister’s time is currently 9 minutes 36 seconds, by what percent does Bob need to improve his time in order run a mile in the same time as his sister?