What is a logarithm?

Lessons

1. On Bianca's 5th birthday gift of $100 cash from her dad. Bianca's dad
   
   promises to double her money yearly if Bianca plans to not spend money
   
   but instead deposit into "daddy's-super-saving-account". Will Bianca be
   
   able to afford her dream car, a Mini Cooper, worth $30,000 when she turns 16?