Answer:
Pledges $600,000
Uncollectible Pledges at 15% -$90,000
Net Pledge Balance $510,000
Pledges - 2017 at 60% $306,000
Unrestricted Net Asset - Contribution $306,000
Account Titles Debit Credit
a)Contribution Receivable $360,000
Allowance for Uncollectible Pledges $54,000
Unrestricted Net Asset - Contribution $306,000
b)Salary Expense (20 * 600) $12,000
Unrestricted Net Asset - Contribution $12,000