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Compute the OPT for each of the following independent cases: Compute the OPT for each of the following independent cases: A. JJ, non-vat registered taxpayer, operates a convenience store from which the gross receipts from sales, and payments on purchases from VAT registered suppliers were as follows (net of taxes): Sales of processed food items 280,000 Sales of non food items 220,000 Purchases of processed food items 100,000 Purchases of non food items 80,000 Salaried of helpers 48,000