percent of change - new - old =, divided by old, percent increase - orig + (% x orig), discount - amount that is saved (% x original) , retail price - wholesale price + mark-up (price on the ticket) , sale price - reduced price after discount [orig - (% x orig)], sales tax - 6% of price (% x original), tip - 15% of bill ( % x original), Mark-up - added to the price to determine the retail price (% x original)  , commission - amount paid for sales (% x original), wholesale price - Price you pay at the factory, percent of error - amount or error, divided by actual amount, Interest - extra paid or earned, use the formula prt, Balance - Principal + Interest, Time in Interest - measured in years, Principal - amount of loan or deposit ($),

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