Brayden bought three 4 for 4 McDouble meals from McDonald’s (4 items for $4). What was his total cost after a 7% sales tax? (HOW DID YOU GET YOUR ANSWER PLEASE SHOW YOUR WORK!!!) A. 52.90
B. 1.04
C. 12.84
D. 458
E. 5x-8y+7
F. 25.30

9514 1404 393

  $4047

Step-by-step explanation:

For an interest rate r compounded n times per year for t years, the effective multiplier is ...

  (1 +r/n)^(nt)

The multiplier for the first 5 years is ...

  (1 +0.07/2)^(2·5) = 1.41059876

The multiplier for the last 5 years is ...

  (1 +0.0728/4)^(4·5) = 1.43437218

Then the account value at the end of 10 years is ...

  $2000(1.41059876)(1.43437218) ≈ $4047 . . . . balance after 10 years