What error did Diep make? There is a subtraction error. Diep will need to save less than $120 each month. There is a subtraction error. Diep will need to save exactly $121 each month. There is a multiplication error. Diep needs to save exactly $120.83 each month. There is a multiplication error. Diep needs to save an average of 120.8 dollars ModifyingAbove 3 with bar each month. Some months he needs to save $120.83 and other months he needs to save $120.84.