54. A doxycycline calcium syrup is preserved with 0.08% (w/v) of methylparaben, 0.02% (w/v) of propylparaben, and 0.10% (w/v) of sodium metabisulfite. Express these concentrations as ratio strengths. 54. 1:1250 w/v methylparaben 1:5000 w/v propylparaben 1:1000 w/v sodium metabisulfite
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