The greens want to put an additional on their house 18 months from now they will need to save 10620 in order to achieve this goal they set aside the same amount each month and after a year they discover they saved 6120 the greens must have just their plan in order to meet their goal so they came up with the following option option A stay with saving the original each mouth but put the addition on one month later than originally planned option b increase the amount of money they saved each month by 120 from their original plan which of the following statements is true