Every month, a girl gets allowance. Assume last year she had no
money, and kept it up to now. Then she spends 1/2 of her money on
clothes, then 1/3 of the remaining money on games, and then 1/4 of
the remaining money on toys. After she bought all of that, she had
$7777 left. Assuming she only gets money by allowance, how much
money does she earn every month?
Must give the working and the answer!!
