Create a SavingsAccount class. Use a static data member annualInterestRate to store the annual interest rate for each of the savers. Each member of the class contains a private
data member savingsBalance indicating the amount the saver currently has on deposit.
Provide member function calculateMonthlyInterest that calculates the monthly interest by
multiplying the balance by annualInterestRate divided by 12; this interest should be added
to savingsBalance. Provide a static member function modifyInterestRate that sets the
static annualInterestRate to a new value. Write a driver program to test class
SavingsAccount. Instantiate two different objects of class SavingsAccount, saver1 and
saver2, with balances of $2000.00 and $3000.00, respectively. Set the annualInterestRate
to 3 percent. Then calculate the monthly interest and print the new balances for each of
the savers. Then set the annualInterestRate to 4 percent, calculate the next month's
interest and print the new balances for each of the savers.