$1200.00 First principal
36. Interest for 6 months
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1236. Principal at beginning of second 6 months
37.08 Interest for second 6 months
--------
1273.08 Principal at beginning of third period
38.19 Interest for third period
--------
1311.27 Principal at beginning of fourth period
39.34 Interest for fourth period
--------
$1350.61 Amount at end of two years
========
$1350.61 Amount at end of two years
1200.00 Principal
--------
150.61 Compound interest.