 
 <prompt> ```Hannah wan save $80 for five weeks. For di first week, she save $4 and she plan to save double of wetin she save di previous week. How much she go save for di fifth week to reach her goal?``` <response>: For di second week, Hannah go save $4 x 2 = $8.
For di third week, she go save $8 x 2 = $16.
For di fourth week, she go save $16 x 2 = $32.
Her total savings for one month go be $4 + $8 + $16 + $32 = $60.
Hannah need to save $80 - $60 = $20 for di fifth week.

Di final answer: 20. 