Exercise 3 - 1 An analysis of the accounts receivable of Grammar Inc. shows the following information: Age Current 1 to 30 days past due 31 to 60 days past due 61 to 90 days past due 91 to 120 days past due 121 to 180 days past due 181 to 360 days past due More than 360 days past due Balance P3,500,000 2,000,000 1,200,000 1,000,000 800,000 400,000 200,000 100,000 % Collectible 99.5 98 95 92 85 70 50 10 Before any adjustments were made, Grammar's allowance for doubtful accounts had a balance of P80,000 1. Determine the required balance of Grammar's doubtful accounts at the end of the reporting period. 2. Determine the doubtful accounts expense Grammar should recognize during the period. 3. Determine the net realizable value of Grammar's accounts receivable at the end of the period