Answer:
Chelsea should report $230,000 as allowance for noncollectable accounts
Step-by-step explanation:
Allowance in beginning = $520,000 
Allowance needed for 2021 sales = $18,000,000 x 2% = $360,000 
Total allowance balance before write off = $880,000 
Less: write off = $ 650,000 
Allowance balance at year end = $520,000 + $360,000 - $650,000 
 = $230,000