Define a class savingsaccount with following characteristics.
use a static variable annualinterestrate of type float to store the annual interest rate for all account holders.
private data member savingsbalance of type float indicating the amount the saver currently has on deposit.
method calculatemonthlyinterest to calculate the monthly interest as (savingsbalance * annualinterestrate / 12). after calculation, the interest should be added to savingsbalance.
static method modifyinterestrate to set annualinterestrate.