Any sample Purity by Reference Standard calculation

please tell me the formula of purity of product calculation against reference standard by HPLC

% Purity of product can be calculated as follows, in case of HPLC method.

Sample response (peak area ratio of sample) ÷ Standard response(peak area ratio of std.) × (Weight std. in mg ÷ Weight of sample in mg) × (Std. Dilutions ÷ Sample dilutions) × (% Assay of Reference Std. on as is basis).

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