john123: a store charges 6% GCT on all sales.What is the total cost of a shirt marked at $30 ?
you can either find 6% of 30 and add the answer to $30
or
you can find 106% of $30.
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example
15% of $900 = 0.15*900 dollars
or
15% of $900 =15/100 *900 dollars
+118703 
