conversations.from: human
conversations.value: Sarah starts saving $5.00 a week for 4 weeks.  Then she saves $10.00 a week for the next 4 weeks.  Then she saves $20.00 a week for the next 4 weeks.  How much money has she saved over 12 weeks?
  Give me a clear explanation.
conversations.from: assistant
conversations.value: She starts with $5.00 a week for 4 weeks so that’s 5*4 = $20.00
  Then she bumps it up to $10.00 a week for 4 weeks so that’s 10*4 = $40.00
  After that, she saves $20.00 a week for 4 weeks so that’s 20*4 = $80.00
  Over 12 weeks she has saved 20+40+80 = $140.00