Frankie is planning to buy a new mp3 player for 90 each month he doubles the amount he saved the previous month. if he saves $3 the first month, in how many months will frankie have enough money to buy the mp3 player?

Frankie will have enough money to buy the player in five (5) months,
and $3 left over after he buys it.

Month    Amount this month    Total so far
   1                        $   3                     $  3 
   2                        $   6                     $  9  
   3                        $ 12                     $ 21
   4                        $ 24                     $ 45 
   5                        $ 48                     $ 93     <===

While Frankie is enjoying the clean, pure music on his new player,
he can think about posting other, future problems like this one in
the <Mathematics> section of , instead of the <English> section.