100% ^= 3600 ships
15% ^= 540 ships
3600-540=3060 good ships
30% of good ships is 918 ships get soled locally
prescribed: 3600 x 15% = 3600 x 0.15 = 540
exported: 3600 x = 2520
sold locally: 3600 - 540 - 2520 = 3600 - 3060 = 540
or
7/10 = 0.7 = 70%
If the prescribed is 15% and the exported is 70% then the remaining is 15%
.15(3600) = 540
Answer: 540
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