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?

The answer is : Sheila must save $ 60 per month to achieve her goal.

The price of bathroom remodeling is $ 810.

After 13 months, she has $ 510

Which mean that she has a $ 300 shortage to cover in 5 months.

Which meant she need to save:

$300 / 5 =

$ 60 / month in order to achieve her goal