I need help on HW 7.1 - 7.4 please. Thank you :)

HW Problem 7.1 - Hansel Company had 2011 credit sales of $2,250,000 and cash sales of $1 million year end, Hansel Co's accounts receivable balance was S600,000 and the allowance for doubtful ac had a $15,000 debit balance. a. What journal entry is required under each of the following assumptions? i. Hansel estimates 2.5% of credit sales are uncollectible ii. Hansel estimates 1.5% of total sales are uncollectible iii. Hansel estimates 6%ofaccounts receivable are uncollectible b. Show the balance sheet presentation for parts i and