//Rename your Custom Field...
//Replace Your Custom Field with "custom_eobi_salary"
//Replace Custom Field wiht "custom_percentage_of_employee_contribution"
//Replace Custom Field wiht "custom_eobi_1_pct_by_employee"
____________________________________________________________


frappe.ui.form.on('Employee', {
    custom_eobi_salary: function(frm) {
        calculate_eobi_1_pct_by_employee(frm);
    },
    custom_percentage_of_employee_contribution: function(frm) {
        calculate_eobi_1_pct_by_employee(frm);
    }
});

function calculate_eobi_1_pct_by_employee(frm) {
    var eobi_salary = frm.doc.custom_eobi_salary;
    var employee_contribution_percentage = frm.doc.custom_percentage_of_employee_contribution;
    
    if (eobi_salary && employee_contribution_percentage) {
        var eobi_1_pct_by_employee = (eobi_salary * (employee_contribution_percentage / 100)).toFixed(2);
        frm.set_value('custom_eobi_1_pct_by_employee', eobi_1_pct_by_employee);
    }
}