The rate of earnings is 6% and the cash to be received in 4 years is $20,000. The present value amount, using the following partial table of present value of $1 at compound interest is
Year
6%
10%
12%
1
0.943
0.909
0.893
2
0.890
0.826
0.797
3
0.840
0.751
0.712
4
0.792
0.683
0.636
a. $12.720
Ob. $16,800
Oc. 513,660
Od. $15.840

$15,840

Explanation:

Present value = Future value / (1 + r)^n

Rate, r = 6% = 0.06

Future value = $20,000

Number of years, n = 4

Present value = $20000 / (1 + 0.06)^4

Present value = $20000 / 1.06^4

Present value = $20,000 / 1.26247696

Present value = $15841.873

Using the partial table of present values :

Present value = Future value * PV(6%, 4)

PV at 6%, 4 years = 0.792

Present value = $20,000 * 0.792 = $15,840

The answer is D.

Goods produced by citizens of the country who are currently overseas.

GDP measures inside of the country anything produced by citizens overseas would not count for a different countries GDP.