Sue Cole is a new accountant with Crane Company. Crane purchased merchandise on account for $$9,000.$ The credit terms are $4/10,$ n$/30.$ Sue has talked with the company's banker and knows that she could earn $7\%$ on any money invested in the company's savings account. $($a$)$ Should Sue pay the invoice within the discount period or should she keep the $$9,000$ in the savings account and pay at the end of the credit period? Support your recommendation with a calculation showing which action would be best. Sue take the discount as it will result in v of $