please show me formulas for how to calculate the values i got wrong

PA8-4 (Algo) Accounting for Accounts and Notes Receivable Transactions [LO 8-2, LO 8-3] [The following information applies to the questions displayed below.] Web Wizard, Incorporated, has provided information technology services for several years. For the first two months of the current year, the company has used the percentage of credit sales method to estimate bad debts. At the end of the first quarter, the company switched to the aging of accounts receivable method. The company entered into the following partial list of transactions during the first quarter. a. During January, the company provided services for $33,000 on credit. b. On January 31, the company estimated bad debts using 2 percent of credit sales. c. On February 4 , the company collected $16,500 of accounts receivable. d. On February 15 , the company wrote off $200 account receivable. e. During February, the company provided services for $23,000 on credit. f. On February 28 , the company estimated bad debts using 2 percent of credit sales. g. On March 1, the company loaned $2,000 to an employee, who signed a 6% note, due in 6 months. h. On March 15 , the company collected $200 on the account written off one month earlier. 1. On March 31, the company accrued interest earned on the note. j. On March 31, the company adjusted for uncollectible accounts, based on the following aging analysis, which includes the preceding transactions (as well as others not listed). Prior to the adjustment, Allowance for Doubtful Accounts has an unadjusted credit balance of $1,130. Prepare the journal entries for items (a) to ( j. (If no entry is required for a transaction/event, select "No Journal Entry Required" the first account field. Do not round intermediate calculations.) Answer is complete but not entirely correct. 1 Required information \begin{tabular}{|c|c|c|c|c|c|} \hline & & service neveriue & 0 & & \\ \hline \multirow[t]{2}{*}{6} & f. & Bad Debt Expense & & 320 & \\ \hline & & Allowance for Doubtful Accounts & 0 & & 320 \\ \hline \multirow[t]{2}{*}{7} & g. & Notes Recelvable (short-term) & & 2,0000 & \\ \hline & & Cash & 0 & & 2,000 \\ \hline \multirow[t]{2}{*}{8} & h(1) & Accounts Receivable & 0 & 2000 & \\ \hline & & Allowance for Doubtful Accounts & & & 2000 \\ \hline \multirow[t]{2}{*}{9} & h(2). & Cash & 0 & 2000 & \\ \hline & & Accounts Receivable & & & 2000 \\ \hline \multirow[t]{2}{*}{10} & i. & Interest Receivable & & 100 & \\ \hline & & Interest Revenue & 0 & & 100 \\ \hline \multirow[t]{2}{*}{11} & j. & Bad Debt Expense & 0 & 492 & \\ \hline & & Allowance for Doubtful Accounts & 0 & & 492 \\ \hline \end{tabular}