how can I do (config)? if my product category like this 1 product brand exam 101 brand A, 102 brand B 2 product type exam 501 type water, 502 type resin my sale deal is every customer can buy mix product category if buy 400.00 each can get free goods 10.00 each from any product in mix cat exam customer order line brand type quantity 1 101 501 100.00 2 101 502 100.00 3 102 501 100.00 4 102 502 100.00 mean customer meet target can get free 10.00 each but customer can select material in mix category chot trinnamaitip

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current transformer balance the power level on both sides. e.g in case of step up, at secondary side voltage rise but current decrease and vice versa in case of step down transformer. but how this power level remains same in case of current transformer and voltage transformer

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