Think of positive integer/ multiply the number by 2/ add 6/ divide 2 /subtract the original number in step 1/ the magic number is

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

How to do this , and can some one explain

Many newspapers carry a certain puzzle in which the reader must unscramble letters to form words. how many ways can the letters of emdangl be arranged? identify the correct unscrambling, then determine the probability of getting that result by randomly selecting one arrangement of the given letters.