// 1.question
let personAccount = {
     firstName: '',
     lastName: '',
     incomes: 0,
     expenses: 0,
     
     totalIncome: function () {
          return;
     },
     totalExpenses: function () {
          return;
     },
     accountInfo: function () {
          return `Name : ${this.firstName} ${this.lastName}
          Income: ${this.incomes} Expense: ${this.expenses}`
     },
     addIncome: function () {
          return;
     },
     addExpense: function () {
          return;
     },
     accountBalance: function () {
          return;
     }
};