Sasha will not make additional deposits or withdrawals.
How much more money will be in her account at First Oak Bank than at River Point after 2 years?
Since in Interest is not stated there will be no interest.This equation can be expressed as: 850=450+x 850-450=x 400=x Sasha deposits $400 at River Point bank. She will have $50 more in First oak bank (without interest).