Write method headers (not the bodies) for the following methods: a. Return a sales commission, given the sales amount and the commission rate. b. Display the calendar for a month, given the month and year. c. Return a square root of a number. d. Test whether a number is even, and returning true if it is. e. Display a message a specified number of times. f. Return the monthly payment, given the loan amount, number of years, and annual interest rate. g. Return the corresponding uppercase letter, given a lowercase letter.

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