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Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?

An 18% discount on a watch saved a shopper $72. find the price of the watch before the discount

How many liters of peroxide should be added to 12 liters of an 8% peroxide solution so that the resulting solution contains 16% peroxide?   original added new amount of peroxide 0.96 liters x 0.96 + x amount of solution 12 liters x 12 + x 0.18 liter 1.14 liters 1.92 liters 2.10 liters