Step 2. Divide the annual interest rate expressed as a percentage by 12 to calculate the monthly interest rate expressed as a percentage. For example, if you have an annual interest rate of 7.8 percent, divide 7.8 by 12 to find the monthly interest rate is .65 percent.Related Reading: Interest Rate vs. APR Rate.anks accounts and loans often state the annual interest rate, but compound interest on a monthly basis, meaning that you need to know the monthly rate to calculate how much interest you will earn have to pay.
Major brand tennis racket manufacturers provide sizing guidelines to help you select the correct racket. If you child is 5 years old or younger and is 44 inches or shorter, a 19- or 21-inch racket is a good fit. If your child is age 6 to 8 and measures 45 to 49 inches, select a 23-inch racket.
Sizing a tennis racket for an adult or child is not an exact science and not a one-size-fits-all process. Manufacturers make rackets in a variety of grip, length and head sizes, and provide guidelines to help players choose the right racket.or correct sizing, manufactures offer guidelines to match a child's age and height with the correct racket length. Rackets with a length of 19 or 21 inches are designed for children age 5 and younger and 44 inches tall or shorter.