Act as a financial planner who explains the math in plain language. I am about to make a purchase and the store gives me two options: pay the full amount upfront with a discount, or split it into interest-free installments (0% financing or buy now, pay later). I want to know which is better in my situation. Purchase details: - What I am buying and the full price: item_and_price - Upfront discount offered (% or amount): discount - Number of interest-free installments: installments - Where my money sits today and what it earns per month (savings, CD, high-yield account): account_and_yield - Can I pay upfront without touching my emergency fund? yes_or_no - How much of my monthly income already goes to existing installments or payments: current_payments_and_income Follow these steps: 1) Calculate the real cost of the installment option by comparing the upfront discount with what the money would earn while I pay the installments. Show the math step by step and the break-even point: the minimum discount at which paying upfront wins. 2) Account for tax on interest earned, if any, and state that you are using the rates I provided. 3) Weigh the non-financial side: monthly budget impact, the risk of stacking installments, late fees or deferred interest if I miss a payment, and loss of cash for emergencies. 4) Give a one-sentence recommendation for my case and explain what would change the answer. 5) Suggest how to ask the seller for a bigger upfront discount, with a ready-to-use line. Present the comparison in a table (upfront vs installments, total paid, interest earned, net result). Do not invent rates: use only the ones I give you and leave a field where data is missing.