Give a definition for the function with the following function declaration.
The class BankAccount is defined in Display 10.5. (Hint: It’s easy if you use
a member function.)
void double_update(BankAccount& the_account);
//Precondition: the_account has previously been given a value
//(that is, its member variables have been given values).
//Postcondition: The account balance has been changed so that
//two years' interest has been posted to the account..
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