Tablet coating solution

Please advise how to calculate quantity of water required to make a coating solution.

Formula Opadry 2%w/w
Tablet core weight 220mg
Tablet core Batch weight 770kg
Batch weight of opadry for 770kg of cores = 20.9kg

Thanks for your help

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If solid content is 12%w/w and avg weight of tablet is 248mg and buildup is 3%. 3% weight gain means for each tablet the weight gain due to coating will be (248 x 3) / 100 = 7.44 mg .