The answer is A. Because you divide first and then multiply and divide again.
Okay, so if you play for thirty minutes each day and there are seven days in a week, so do 30 times 7 and you have your answer.
He spend: 1440*2.5=3600
he earn: 0.25*1440*12=4320
[because he sells 0.25/each and buy 1440 dozen so 1440*12]
4320-3600=720
The majority of the members are 13 years old (50/50 13 or younger). Most of the members are on the older side, with the exception of one member, who is significantly younger than the others.
