Final answer:
To buy a $20,000 car with a 20% down payment, Sandy must save a larger monthly amount than $163.50 over 2 years, as the current saving plan brings her just short of the required $4,000, even with interest from a 2% APY savings account.
Step-by-step explanation:
Sandy plans to save $163.50 a month for the next 2 years to make a 20% down payment on a $20,000 car. With a 2% APY in her savings account, she will accumulate a total of:
Monthly savings × months + interest
$163.50 × 24 months = $3,924
The interest on her savings will add a small amount to this sum, but it won't be significant enough to reach the 20% down payment required for the car, which is:
20% of $20,000 = $4,000
Sandy's savings of $3,924 is just short of the $4,000 needed for the down payment, not accounting for the interest, which would be minimal at 2% APY. Therefore, for Sandy's plan to work, she would need to save a larger monthly amount (Option C) to reach the $4,000 down payment required. While finding a higher-yield savings account could help grow her savings faster, it is unlikely that savings account yields would increase sufficiently to make up the shortfall within 2 years. This option is not mentioned in the provided details as a viable alternative in this context.