The greens want to put an addition on their house 18 months from now. they will need to save $10,620 in order to achieve this goal. they set aside the same amount each month, and after a year discover they have saved $6,120. the greens must adjust their plan in order to meet their goal, so they came up with the following optionsa. only option a will allow them to meet their goal. b.only option b will allow them to meet their goal. c.both options a and b will allow them to meet their goal. d.neither option a nor option b will allow them to meet their goal.