Processing and executing orders on a first-in, first-out basis is required by Fair Dealing rather than Responsibilities of Supervisors.

The investor has direct control over which assets are bought and sold and the timing of the transaction.

If you use your calculator, you will have to do it by trial and error. Choose an arbitrary value for N, and work out the future value for both investments. If there is a discrepancy between the 2 values, you will have to amend your estimate. Let us choose N = 10.
Using Texas Instruments BA II Plus:
1 st Investment 1000 +- PV: 1,000.00 10 N: N = 10.00 7 I/Y: I/Y= 7.00 CPT FV: FV = 1967.15
2 nd Investment 1200 +- PV: 1,200.00 10 N: N = 10.00 6 I/Y: I/Y= 6.00 CPT FV: FV = 2149.02
The first investment is slower to increase. Try N=15 and see what happens. Continue until you hit upon the correct value = 20
Using Hewlett Packard hp 12 C:
Investment 1 f CLEAR FIN: 0.00000000 f CLEAR REG: 0.00000000 10 n: -10.00000000 7 i: 7.00000000
1 000 CHS PV: -1,000.000000 g END: -1,000.000000 FV: 1967,151357
Investment 2 f CLEAR FIN: 0.00000000 f CLEAR REG: 0.00000000 10 n: -10.00000000 6 i: 6.00000000
1 200 CHS PV: -1,200.000000 g END: -1,200.000000 FV: 2,149.017236
The first investment is slower to increase. Try N=15 and see what happen. Continue until you hit upon the correct value = 20.

I). If the error, which will understate current-year net income, is not discovered, the overstatement of the subsequent year's income will effectively correct the Retained Earnings account.
II). Net Sales (100%) less the cost of goods sold equals gross profit. 100% - 55% = 45%.
III). Assume that cost of goods sold is 44% of net sales. Then the gross profit must be 56% of net sales.
When cost of goods sold increases to 45%, the gross profit is lowered to 55%.
IV). Cost of goods sold/Average inventory = Inventory turnover. The turnover rate is 10.0 to 1
($200,000/$2,000 = 10.0).

Antidilutive securities would increase EPS if exercised or converted to common stock.