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How can I make up 100ml of a solution containing Compound A (solid, purity of 83.7%) at 90 ug/ml and compound B (liquid, density 1.12 and purity of 90.5) at 30 ug/mL for HPLC reference standard? Please write all the steps for making this solution. The solvent is 0.1M H2PO4 in 75% methanol.

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