Can you please help me correct those red answers?

Problem 7-4 From inception of operations to December 31, 2017, Fortner Corporation provided for uncollectible accounts receivable under the allowance method. The provisions are recorded, based on analyses of customers with different risk characteristics. Bad debts written off were charged to the allowance account; recoveries of bad debts previously written off were credited to the allowance account, and no year-end adjustments to the allowance account were made. Fortner's usual credit terms are net 30 days. The balance in Allowance for Doubtful Accounts was $130,000 at January 1, 2017. During 2017, credit sales totaled $9,000,000, the provision for doubtful accounts was determined to be $180,000, $90,000 of bad debts were written off, and recoveries of accounts previously written off amounted to $15,000. Fortner installed a computer system in November 2017, and an aging of accounts receivable was prepared for the first time as of December 31, 2017. A summary of the aging is as follows. Estimated % Uncollectible 2% 10% 25% 80% Classification by Month of Sale Balance in Each Category November-December 2017 July-October January-June Prior to 1/1/17 $1,080,000 650,000 420,000 150,000 $2,300,000 Based on the review of collectibility of the account balances in the "prior to 1/1/17" aging category, additional receivables totaling $60,000 were written off as of December 31, 2017. The 80% uncollectible estimate apples to the remaining $90,000 in the category. Effective with the year ended December 31, 2017, Fortner adopted a different method for estimating the allowance for doubtful accounts at the amount indicated by the year-end aging analysis of accounts receivable