Question

A mother during a hectic day, was convinced by her son that he should
have a weekly allowance that is increased every two weeks. In weeks one and two
he receives 1 cent per week, in weeks three and four he receives 2 cents per week. If
his allowance continues to double every two weeks, how much would his allowance
be in week 20?

Answer 1

\[2^9\]

Answer 2

is that 20?