Hi this table may help you:
1/100 to 1/250 multiply by 0.4
1/200 to 1/250 multiply by 0.8
1/300 to 1/250 multiply by 1.2
1/400 to 1/250 multiply by 1.6
If you are printing:
1/100 to 1/250 print to 40%
1/200 to 1/250 print to 80%
1/300 to 1/250 print to 120%
1/400 to 1/250 print to 160%
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