Sheila has a plan to save $45 a month for 18 months so that she has $810 to remodel her bathroom. after 13 months sheila has saved $510. if the most sheila can possibly save is $70 per month, which of the following statements is true? a. sheila will meet her goal and does not need to adjust her plan. b. sheila must save $50 per month to achieve her goal. c. sheila must save $60 per month to achieve her goal. d. sheila will not be able to achieve her goal.