(a) pharmaceutical consumption among low income and other income patients will decrease by "10\u00d7(-0.3) = -3%" % and "10\u00d7(-0.05) = -0.5" % respectively.
(b) If the original price for the product was $10 for low income patients and $30 for high income patients, then the 10% price increase will increase total revenue of the pharmaceutical product.
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