17. (Ignore income taxes in this problem.) If you wanted to withdraw $12,000 from a bank account at the end of each of the next 20 years, approximately how much would you have to invest in the account today assuming a 6% interest rate?
a. $20,924
b. $38,462
c. $74,880
d. $137,604

  d.  $137,604

Step-by-step explanation:

The amortization formula is good for this. It tells you the principal P that must be invested to support payments of A each year for t years when the interest rate is r:

  P = A(1 -(1 +r)^-t)/r

  P = $12,000(1 -1.06^-20)/0.06 ≈ $137,639.05

The closest answer choice is $137,604.

first, we define the variables:

x: number of years after 1950

f (x): amount of vinyl sold.

then, with the variables defined, we have:

68594 vinyl records were sold in 1958 > f (8) = 68594

91299 vinyl records were sold in 1961 > f (11) = 91299

38720 vinyl records were sold in 1952 > f (2) = 38720

161743 vinyl records were sold in 1967 > f (17) = 161743

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step-by-step explanation:

answer: 1inch=7days  

12inch=12*7=84days

step-by-step explanation: